Get error codes

Applications running in Node.js will generally experience four categories of
errors:

• Standard JavaScript errors such as {EvalError}, {SyntaxError}, {RangeError},
  {ReferenceError}, {TypeError}, and {URIError}.
• System errors triggered by underlying operating system constraints such
  as attempting to open a file that does not exist or attempting to send data
  over a closed socket.
• User-specified errors triggered by application code.
• AssertionErrors are a special class of error that can be triggered when
  Node.js detects an exceptional logic violation that should never occur. These
  are raised typically by the node:assert module.

All JavaScript and system errors raised by Node.js inherit from, or are
instances of, the standard JavaScript {Error} class and are guaranteed
to provide at least the properties available on that class.

Error propagation and interception

Node.js supports several mechanisms for propagating and handling errors that
occur while an application is running. How these errors are reported and
handled depends entirely on the type of Error and the style of the API that is
called.

All JavaScript errors are handled as exceptions that immediately generate
and throw an error using the standard JavaScript throw mechanism. These
are handled using the try…catch construct provided by the
JavaScript language.

// Throws with a ReferenceError because z is not defined.
try {
  const m = 1;
  const n = m + z;
} catch (err) {
  // Handle the error here.
}

Any use of the JavaScript throw mechanism will raise an exception that
must be handled using try…catch or the Node.js process will exit
immediately.

With few exceptions, Synchronous APIs (any blocking method that does not
accept a callback function, such as fs.readFileSync), will use throw
to report errors.

Errors that occur within Asynchronous APIs may be reported in multiple ways:

• Most asynchronous methods that accept a callback function will accept an
  Error object passed as the first argument to that function. If that first
  argument is not null and is an instance of Error, then an error occurred
  that should be handled.

  const fs = require('node:fs');
  fs.readFile('a file that does not exist', (err, data) => {
    if (err) {
      console.error('There was an error reading the file!', err);
      return;
    }
    // Otherwise handle the data
  });

• When an asynchronous method is called on an object that is an
  EventEmitter, errors can be routed to that object’s 'error' event.

  const net = require('node:net');
  const connection = net.connect('localhost');
  
  // Adding an 'error' event handler to a stream:
  connection.on('error', (err) => {
    // If the connection is reset by the server, or if it can't
    // connect at all, or on any sort of error encountered by
    // the connection, the error will be sent here.
    console.error(err);
  });
  
  connection.pipe(process.stdout);

• A handful of typically asynchronous methods in the Node.js API may still
  use the throw mechanism to raise exceptions that must be handled using
  try…catch. There is no comprehensive list of such methods; please
  refer to the documentation of each method to determine the appropriate
  error handling mechanism required.

The use of the 'error' event mechanism is most common for stream-based
and event emitter-based APIs, which themselves represent a series of
asynchronous operations over time (as opposed to a single operation that may
pass or fail).

For all EventEmitter objects, if an 'error' event handler is not
provided, the error will be thrown, causing the Node.js process to report an
uncaught exception and crash unless either: The domain module is
used appropriately or a handler has been registered for the
'uncaughtException' event.

const EventEmitter = require('node:events');
const ee = new EventEmitter();

setImmediate(() => {
  // This will crash the process because no 'error' event
  // handler has been added.
  ee.emit('error', new Error('This will crash'));
});

Errors generated in this way cannot be intercepted using try…catch as
they are thrown after the calling code has already exited.

Developers must refer to the documentation for each method to determine
exactly how errors raised by those methods are propagated.

Error-first callbacks

Most asynchronous methods exposed by the Node.js core API follow an idiomatic
pattern referred to as an error-first callback. With this pattern, a callback
function is passed to the method as an argument. When the operation either
completes or an error is raised, the callback function is called with the
Error object (if any) passed as the first argument. If no error was raised,
the first argument will be passed as null.

const fs = require('node:fs');

function errorFirstCallback(err, data) {
  if (err) {
    console.error('There was an error', err);
    return;
  }
  console.log(data);
}

fs.readFile('/some/file/that/does-not-exist', errorFirstCallback);
fs.readFile('/some/file/that/does-exist', errorFirstCallback);

The JavaScript try…catch mechanism cannot be used to intercept errors
generated by asynchronous APIs. A common mistake for beginners is to try to
use throw inside an error-first callback:

// THIS WILL NOT WORK:
const fs = require('node:fs');

try {
  fs.readFile('/some/file/that/does-not-exist', (err, data) => {
    // Mistaken assumption: throwing here...
    if (err) {
      throw err;
    }
  });
} catch (err) {
  // This will not catch the throw!
  console.error(err);
}

This will not work because the callback function passed to fs.readFile() is
called asynchronously. By the time the callback has been called, the
surrounding code, including the try…catch block, will have already exited.
Throwing an error inside the callback can crash the Node.js process in most
cases. If domains are enabled, or a handler has been registered with
process.on('uncaughtException'), such errors can be intercepted.

Class: Error

A generic JavaScript {Error} object that does not denote any specific
circumstance of why the error occurred. Error objects capture a «stack trace»
detailing the point in the code at which the Error was instantiated, and may
provide a text description of the error.

All errors generated by Node.js, including all system and JavaScript errors,
will either be instances of, or inherit from, the Error class.

new Error(message[, options])

• message {string}
• options {Object}
  • cause {any} The error that caused the newly created error.

Creates a new Error object and sets the error.message property to the
provided text message. If an object is passed as message, the text message
is generated by calling String(message). If the cause option is provided,
it is assigned to the error.cause property. The error.stack property will
represent the point in the code at which new Error() was called. Stack traces
are dependent on V8’s stack trace API. Stack traces extend only to either
(a) the beginning of synchronous code execution, or (b) the number of frames
given by the property Error.stackTraceLimit, whichever is smaller.

Error.captureStackTrace(targetObject[, constructorOpt])

• targetObject {Object}
• constructorOpt {Function}

Creates a .stack property on targetObject, which when accessed returns
a string representing the location in the code at which
Error.captureStackTrace() was called.

const myObject = {};
Error.captureStackTrace(myObject);
myObject.stack;  // Similar to `new Error().stack`

The first line of the trace will be prefixed with
${myObject.name}: ${myObject.message}.

The optional constructorOpt argument accepts a function. If given, all frames
above constructorOpt, including constructorOpt, will be omitted from the
generated stack trace.

The constructorOpt argument is useful for hiding implementation
details of error generation from the user. For instance:

function MyError() {
  Error.captureStackTrace(this, MyError);
}

// Without passing MyError to captureStackTrace, the MyError
// frame would show up in the .stack property. By passing
// the constructor, we omit that frame, and retain all frames below it.
new MyError().stack;

Error.stackTraceLimit

• {number}

The Error.stackTraceLimit property specifies the number of stack frames
collected by a stack trace (whether generated by new Error().stack or
Error.captureStackTrace(obj)).

The default value is 10 but may be set to any valid JavaScript number. Changes
will affect any stack trace captured after the value has been changed.

If set to a non-number value, or set to a negative number, stack traces will
not capture any frames.

error.cause

• {any}

If present, the error.cause property is the underlying cause of the Error.
It is used when catching an error and throwing a new one with a different
message or code in order to still have access to the original error.

The error.cause property is typically set by calling
new Error(message, { cause }). It is not set by the constructor if the
cause option is not provided.

This property allows errors to be chained. When serializing Error objects,
util.inspect() recursively serializes error.cause if it is set.

const cause = new Error('The remote HTTP server responded with a 500 status');
const symptom = new Error('The message failed to send', { cause });

console.log(symptom);
// Prints:
//   Error: The message failed to send
//       at REPL2:1:17
//       at Script.runInThisContext (node:vm:130:12)
//       ... 7 lines matching cause stack trace ...
//       at [_line] [as _line] (node:internal/readline/interface:886:18) {
//     [cause]: Error: The remote HTTP server responded with a 500 status
//         at REPL1:1:15
//         at Script.runInThisContext (node:vm:130:12)
//         at REPLServer.defaultEval (node:repl:574:29)
//         at bound (node:domain:426:15)
//         at REPLServer.runBound [as eval] (node:domain:437:12)
//         at REPLServer.onLine (node:repl:902:10)
//         at REPLServer.emit (node:events:549:35)
//         at REPLServer.emit (node:domain:482:12)
//         at [_onLine] [as _onLine] (node:internal/readline/interface:425:12)
//         at [_line] [as _line] (node:internal/readline/interface:886:18)

error.code

• {string}

The error.code property is a string label that identifies the kind of error.
error.code is the most stable way to identify an error. It will only change
between major versions of Node.js. In contrast, error.message strings may
change between any versions of Node.js. See Node.js error codes for details
about specific codes.

error.message

• {string}

The error.message property is the string description of the error as set by
calling new Error(message). The message passed to the constructor will also
appear in the first line of the stack trace of the Error, however changing
this property after the Error object is created may not change the first
line of the stack trace (for example, when error.stack is read before this
property is changed).

const err = new Error('The message');
console.error(err.message);
// Prints: The message

error.stack

• {string}

The error.stack property is a string describing the point in the code at which
the Error was instantiated.

Error: Things keep happening!
   at /home/gbusey/file.js:525:2
   at Frobnicator.refrobulate (/home/gbusey/business-logic.js:424:21)
   at Actor.<anonymous> (/home/gbusey/actors.js:400:8)
   at increaseSynergy (/home/gbusey/actors.js:701:6)

The first line is formatted as <error class name>: <error message>, and
is followed by a series of stack frames (each line beginning with «at «).
Each frame describes a call site within the code that lead to the error being
generated. V8 attempts to display a name for each function (by variable name,
function name, or object method name), but occasionally it will not be able to
find a suitable name. If V8 cannot determine a name for the function, only
location information will be displayed for that frame. Otherwise, the
determined function name will be displayed with location information appended
in parentheses.

Frames are only generated for JavaScript functions. If, for example, execution
synchronously passes through a C++ addon function called cheetahify which
itself calls a JavaScript function, the frame representing the cheetahify call
will not be present in the stack traces:

const cheetahify = require('./native-binding.node');

function makeFaster() {
  // `cheetahify()` *synchronously* calls speedy.
  cheetahify(function speedy() {
    throw new Error('oh no!');
  });
}

makeFaster();
// will throw:
//   /home/gbusey/file.js:6
//       throw new Error('oh no!');
//           ^
//   Error: oh no!
//       at speedy (/home/gbusey/file.js:6:11)
//       at makeFaster (/home/gbusey/file.js:5:3)
//       at Object.<anonymous> (/home/gbusey/file.js:10:1)
//       at Module._compile (module.js:456:26)
//       at Object.Module._extensions..js (module.js:474:10)
//       at Module.load (module.js:356:32)
//       at Function.Module._load (module.js:312:12)
//       at Function.Module.runMain (module.js:497:10)
//       at startup (node.js:119:16)
//       at node.js:906:3

The location information will be one of:

• native, if the frame represents a call internal to V8 (as in [].forEach).
• plain-filename.js:line:column, if the frame represents a call internal
  to Node.js.
• /absolute/path/to/file.js:line:column, if the frame represents a call in
  a user program (using CommonJS module system), or its dependencies.
• <transport-protocol>:///url/to/module/file.mjs:line:column, if the frame
  represents a call in a user program (using ES module system), or
  its dependencies.

The string representing the stack trace is lazily generated when the
error.stack property is accessed.

The number of frames captured by the stack trace is bounded by the smaller of
Error.stackTraceLimit or the number of available frames on the current event
loop tick.

Class: AssertionError

• Extends: {errors.Error}

Indicates the failure of an assertion. For details, see
Class: assert.AssertionError.

Class: RangeError

• Extends: {errors.Error}

Indicates that a provided argument was not within the set or range of
acceptable values for a function; whether that is a numeric range, or
outside the set of options for a given function parameter.

require('node:net').connect(-1);
// Throws "RangeError: "port" option should be >= 0 and < 65536: -1"

Node.js will generate and throw RangeError instances immediately as a form
of argument validation.

Class: ReferenceError

• Extends: {errors.Error}

Indicates that an attempt is being made to access a variable that is not
defined. Such errors commonly indicate typos in code, or an otherwise broken
program.

While client code may generate and propagate these errors, in practice, only V8
will do so.

doesNotExist;
// Throws ReferenceError, doesNotExist is not a variable in this program.

Unless an application is dynamically generating and running code,
ReferenceError instances indicate a bug in the code or its dependencies.

Class: SyntaxError

• Extends: {errors.Error}

Indicates that a program is not valid JavaScript. These errors may only be
generated and propagated as a result of code evaluation. Code evaluation may
happen as a result of eval, Function, require, or vm. These errors
are almost always indicative of a broken program.

try {
  require('node:vm').runInThisContext('binary ! isNotOk');
} catch (err) {
  // 'err' will be a SyntaxError.
}

SyntaxError instances are unrecoverable in the context that created them –
they may only be caught by other contexts.

Class: SystemError

• Extends: {errors.Error}

Node.js generates system errors when exceptions occur within its runtime
environment. These usually occur when an application violates an operating
system constraint. For example, a system error will occur if an application
attempts to read a file that does not exist.

• address {string} If present, the address to which a network connection
  failed
• code {string} The string error code
• dest {string} If present, the file path destination when reporting a file
  system error
• errno {number} The system-provided error number
• info {Object} If present, extra details about the error condition
• message {string} A system-provided human-readable description of the error
• path {string} If present, the file path when reporting a file system error
• port {number} If present, the network connection port that is not available
• syscall {string} The name of the system call that triggered the error

error.address

• {string}

If present, error.address is a string describing the address to which a
network connection failed.

error.code

• {string}

The error.code property is a string representing the error code.

error.dest

• {string}

If present, error.dest is the file path destination when reporting a file
system error.

error.errno

• {number}

The error.errno property is a negative number which corresponds
to the error code defined in libuv Error handling.

On Windows the error number provided by the system will be normalized by libuv.

To get the string representation of the error code, use
util.getSystemErrorName(error.errno).

error.info

• {Object}

If present, error.info is an object with details about the error condition.

error.message

• {string}

error.message is a system-provided human-readable description of the error.

error.path

• {string}

If present, error.path is a string containing a relevant invalid pathname.

error.port

• {number}

If present, error.port is the network connection port that is not available.

error.syscall

• {string}

The error.syscall property is a string describing the syscall that failed.

Common system errors

This is a list of system errors commonly-encountered when writing a Node.js
program. For a comprehensive list, see the errno(3) man page.

• EACCES (Permission denied): An attempt was made to access a file in a way
  forbidden by its file access permissions.

• EADDRINUSE (Address already in use): An attempt to bind a server
  (net, http, or https) to a local address failed due to
  another server on the local system already occupying that address.

• ECONNREFUSED (Connection refused): No connection could be made because the
  target machine actively refused it. This usually results from trying to
  connect to a service that is inactive on the foreign host.

• ECONNRESET (Connection reset by peer): A connection was forcibly closed by
  a peer. This normally results from a loss of the connection on the remote
  socket due to a timeout or reboot. Commonly encountered via the http
  and net modules.

• EEXIST (File exists): An existing file was the target of an operation that
  required that the target not exist.

• EISDIR (Is a directory): An operation expected a file, but the given
  pathname was a directory.

• EMFILE (Too many open files in system): Maximum number of
  file descriptors allowable on the system has been reached, and
  requests for another descriptor cannot be fulfilled until at least one
  has been closed. This is encountered when opening many files at once in
  parallel, especially on systems (in particular, macOS) where there is a low
  file descriptor limit for processes. To remedy a low limit, run
  ulimit -n 2048 in the same shell that will run the Node.js process.

• ENOENT (No such file or directory): Commonly raised by fs operations
  to indicate that a component of the specified pathname does not exist. No
  entity (file or directory) could be found by the given path.

• ENOTDIR (Not a directory): A component of the given pathname existed, but
  was not a directory as expected. Commonly raised by fs.readdir.

• ENOTEMPTY (Directory not empty): A directory with entries was the target
  of an operation that requires an empty directory, usually fs.unlink.

• ENOTFOUND (DNS lookup failed): Indicates a DNS failure of either
  EAI_NODATA or EAI_NONAME. This is not a standard POSIX error.

• EPERM (Operation not permitted): An attempt was made to perform an
  operation that requires elevated privileges.

• EPIPE (Broken pipe): A write on a pipe, socket, or FIFO for which there is
  no process to read the data. Commonly encountered at the net and
  http layers, indicative that the remote side of the stream being
  written to has been closed.

• ETIMEDOUT (Operation timed out): A connect or send request failed because
  the connected party did not properly respond after a period of time. Usually
  encountered by http or net. Often a sign that a socket.end()
  was not properly called.

Class: TypeError

• Extends {errors.Error}

Indicates that a provided argument is not an allowable type. For example,
passing a function to a parameter which expects a string would be a TypeError.

require('node:url').parse(() => { });
// Throws TypeError, since it expected a string.

Node.js will generate and throw TypeError instances immediately as a form
of argument validation.

Exceptions vs. errors

A JavaScript exception is a value that is thrown as a result of an invalid
operation or as the target of a throw statement. While it is not required
that these values are instances of Error or classes which inherit from
Error, all exceptions thrown by Node.js or the JavaScript runtime will be
instances of Error.

Some exceptions are unrecoverable at the JavaScript layer. Such exceptions
will always cause the Node.js process to crash. Examples include assert()
checks or abort() calls in the C++ layer.

OpenSSL errors

Errors originating in crypto or tls are of class Error, and in addition to
the standard .code and .message properties, may have some additional
OpenSSL-specific properties.

error.opensslErrorStack

An array of errors that can give context to where in the OpenSSL library an
error originates from.

error.function

The OpenSSL function the error originates in.

error.library

The OpenSSL library the error originates in.

error.reason

A human-readable string describing the reason for the error.

Node.js error codes

ABORT_ERR

Used when an operation has been aborted (typically using an AbortController).

APIs not using AbortSignals typically do not raise an error with this code.

This code does not use the regular ERR_* convention Node.js errors use in
order to be compatible with the web platform’s AbortError.

ERR_AMBIGUOUS_ARGUMENT

A function argument is being used in a way that suggests that the function
signature may be misunderstood. This is thrown by the node:assert module when
the message parameter in assert.throws(block, message) matches the error
message thrown by block because that usage suggests that the user believes
message is the expected message rather than the message the AssertionError
will display if block does not throw.

ERR_ARG_NOT_ITERABLE

An iterable argument (i.e. a value that works with for...of loops) was
required, but not provided to a Node.js API.

ERR_ASSERTION

A special type of error that can be triggered whenever Node.js detects an
exceptional logic violation that should never occur. These are raised typically
by the node:assert module.

ERR_ASYNC_CALLBACK

An attempt was made to register something that is not a function as an
AsyncHooks callback.

ERR_ASYNC_TYPE

The type of an asynchronous resource was invalid. Users are also able
to define their own types if using the public embedder API.

ERR_BROTLI_COMPRESSION_FAILED

Data passed to a Brotli stream was not successfully compressed.

ERR_BROTLI_INVALID_PARAM

An invalid parameter key was passed during construction of a Brotli stream.

ERR_BUFFER_CONTEXT_NOT_AVAILABLE

An attempt was made to create a Node.js Buffer instance from addon or embedder
code, while in a JS engine Context that is not associated with a Node.js
instance. The data passed to the Buffer method will have been released
by the time the method returns.

When encountering this error, a possible alternative to creating a Buffer
instance is to create a normal Uint8Array, which only differs in the
prototype of the resulting object. Uint8Arrays are generally accepted in all
Node.js core APIs where Buffers are; they are available in all Contexts.

ERR_BUFFER_OUT_OF_BOUNDS

An operation outside the bounds of a Buffer was attempted.

ERR_BUFFER_TOO_LARGE

An attempt has been made to create a Buffer larger than the maximum allowed
size.

ERR_CANNOT_WATCH_SIGINT

Node.js was unable to watch for the SIGINT signal.

ERR_CHILD_CLOSED_BEFORE_REPLY

A child process was closed before the parent received a reply.

ERR_CHILD_PROCESS_IPC_REQUIRED

Used when a child process is being forked without specifying an IPC channel.

ERR_CHILD_PROCESS_STDIO_MAXBUFFER

Used when the main process is trying to read data from the child process’s
STDERR/STDOUT, and the data’s length is longer than the maxBuffer option.

ERR_CLOSED_MESSAGE_PORT

There was an attempt to use a MessagePort instance in a closed
state, usually after .close() has been called.

ERR_CONSOLE_WRITABLE_STREAM

Console was instantiated without stdout stream, or Console has a
non-writable stdout or stderr stream.

ERR_CONSTRUCT_CALL_INVALID

A class constructor was called that is not callable.

ERR_CONSTRUCT_CALL_REQUIRED

A constructor for a class was called without new.

ERR_CONTEXT_NOT_INITIALIZED

The vm context passed into the API is not yet initialized. This could happen
when an error occurs (and is caught) during the creation of the
context, for example, when the allocation fails or the maximum call stack
size is reached when the context is created.

ERR_CRYPTO_CUSTOM_ENGINE_NOT_SUPPORTED

A client certificate engine was requested that is not supported by the version
of OpenSSL being used.

ERR_CRYPTO_ECDH_INVALID_FORMAT

An invalid value for the format argument was passed to the crypto.ECDH()
class getPublicKey() method.

ERR_CRYPTO_ECDH_INVALID_PUBLIC_KEY

An invalid value for the key argument has been passed to the
crypto.ECDH() class computeSecret() method. It means that the public
key lies outside of the elliptic curve.

ERR_CRYPTO_ENGINE_UNKNOWN

An invalid crypto engine identifier was passed to
require('node:crypto').setEngine().

ERR_CRYPTO_FIPS_FORCED

The --force-fips command-line argument was used but there was an attempt
to enable or disable FIPS mode in the node:crypto module.

ERR_CRYPTO_FIPS_UNAVAILABLE

An attempt was made to enable or disable FIPS mode, but FIPS mode was not
available.

ERR_CRYPTO_HASH_FINALIZED

hash.digest() was called multiple times. The hash.digest() method must
be called no more than one time per instance of a Hash object.

ERR_CRYPTO_HASH_UPDATE_FAILED

hash.update() failed for any reason. This should rarely, if ever, happen.

ERR_CRYPTO_INCOMPATIBLE_KEY

The given crypto keys are incompatible with the attempted operation.

ERR_CRYPTO_INCOMPATIBLE_KEY_OPTIONS

The selected public or private key encoding is incompatible with other options.

ERR_CRYPTO_INITIALIZATION_FAILED

Initialization of the crypto subsystem failed.

ERR_CRYPTO_INVALID_AUTH_TAG

An invalid authentication tag was provided.

ERR_CRYPTO_INVALID_COUNTER

An invalid counter was provided for a counter-mode cipher.

ERR_CRYPTO_INVALID_CURVE

An invalid elliptic-curve was provided.

ERR_CRYPTO_INVALID_DIGEST

An invalid crypto digest algorithm was specified.

ERR_CRYPTO_INVALID_IV

An invalid initialization vector was provided.

ERR_CRYPTO_INVALID_JWK

An invalid JSON Web Key was provided.

ERR_CRYPTO_INVALID_KEY_OBJECT_TYPE

The given crypto key object’s type is invalid for the attempted operation.

ERR_CRYPTO_INVALID_KEYLEN

An invalid key length was provided.

ERR_CRYPTO_INVALID_KEYPAIR

An invalid key pair was provided.

ERR_CRYPTO_INVALID_KEYTYPE

An invalid key type was provided.

ERR_CRYPTO_INVALID_MESSAGELEN

An invalid message length was provided.

ERR_CRYPTO_INVALID_SCRYPT_PARAMS

Invalid scrypt algorithm parameters were provided.

ERR_CRYPTO_INVALID_STATE

A crypto method was used on an object that was in an invalid state. For
instance, calling cipher.getAuthTag() before calling cipher.final().

ERR_CRYPTO_INVALID_TAG_LENGTH

An invalid authentication tag length was provided.

ERR_CRYPTO_JOB_INIT_FAILED

Initialization of an asynchronous crypto operation failed.

ERR_CRYPTO_JWK_UNSUPPORTED_CURVE

Key’s Elliptic Curve is not registered for use in the
JSON Web Key Elliptic Curve Registry.

ERR_CRYPTO_JWK_UNSUPPORTED_KEY_TYPE

Key’s Asymmetric Key Type is not registered for use in the
JSON Web Key Types Registry.

ERR_CRYPTO_OPERATION_FAILED

A crypto operation failed for an otherwise unspecified reason.

ERR_CRYPTO_PBKDF2_ERROR

The PBKDF2 algorithm failed for unspecified reasons. OpenSSL does not provide
more details and therefore neither does Node.js.

ERR_CRYPTO_SCRYPT_INVALID_PARAMETER

One or more crypto.scrypt() or crypto.scryptSync() parameters are
outside their legal range.

ERR_CRYPTO_SCRYPT_NOT_SUPPORTED

Node.js was compiled without scrypt support. Not possible with the official
release binaries but can happen with custom builds, including distro builds.

ERR_CRYPTO_SIGN_KEY_REQUIRED

A signing key was not provided to the sign.sign() method.

ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH

crypto.timingSafeEqual() was called with Buffer, TypedArray, or
DataView arguments of different lengths.

ERR_CRYPTO_UNKNOWN_CIPHER

An unknown cipher was specified.

ERR_CRYPTO_UNKNOWN_DH_GROUP

An unknown Diffie-Hellman group name was given. See
crypto.getDiffieHellman() for a list of valid group names.

ERR_CRYPTO_UNSUPPORTED_OPERATION

An attempt to invoke an unsupported crypto operation was made.

ERR_DEBUGGER_ERROR

An error occurred with the debugger.

ERR_DEBUGGER_STARTUP_ERROR

The debugger timed out waiting for the required host/port to be free.

ERR_DLOPEN_DISABLED

Loading native addons has been disabled using --no-addons.

ERR_DLOPEN_FAILED

A call to process.dlopen() failed.

ERR_DIR_CLOSED

The fs.Dir was previously closed.

ERR_DIR_CONCURRENT_OPERATION

A synchronous read or close call was attempted on an fs.Dir which has
ongoing asynchronous operations.

ERR_DNS_SET_SERVERS_FAILED

c-ares failed to set the DNS server.

ERR_DOMAIN_CALLBACK_NOT_AVAILABLE

The node:domain module was not usable since it could not establish the
required error handling hooks, because
process.setUncaughtExceptionCaptureCallback() had been called at an
earlier point in time.

ERR_DOMAIN_CANNOT_SET_UNCAUGHT_EXCEPTION_CAPTURE

process.setUncaughtExceptionCaptureCallback() could not be called
because the node:domain module has been loaded at an earlier point in time.

The stack trace is extended to include the point in time at which the
node:domain module had been loaded.

ERR_DUPLICATE_STARTUP_SNAPSHOT_MAIN_FUNCTION

v8.startupSnapshot.setDeserializeMainFunction() could not be called
because it had already been called before.

ERR_ENCODING_INVALID_ENCODED_DATA

Data provided to TextDecoder() API was invalid according to the encoding
provided.

ERR_ENCODING_NOT_SUPPORTED

Encoding provided to TextDecoder() API was not one of the
WHATWG Supported Encodings.

ERR_EVAL_ESM_CANNOT_PRINT

--print cannot be used with ESM input.

ERR_EVENT_RECURSION

Thrown when an attempt is made to recursively dispatch an event on EventTarget.

ERR_EXECUTION_ENVIRONMENT_NOT_AVAILABLE

The JS execution context is not associated with a Node.js environment.
This may occur when Node.js is used as an embedded library and some hooks
for the JS engine are not set up properly.

ERR_FALSY_VALUE_REJECTION

A Promise that was callbackified via util.callbackify() was rejected with a
falsy value.

ERR_FEATURE_UNAVAILABLE_ON_PLATFORM

Used when a feature that is not available
to the current platform which is running Node.js is used.

ERR_FS_CP_DIR_TO_NON_DIR

An attempt was made to copy a directory to a non-directory (file, symlink,
etc.) using fs.cp().

ERR_FS_CP_EEXIST

An attempt was made to copy over a file that already existed with
fs.cp(), with the force and errorOnExist set to true.

ERR_FS_CP_EINVAL

When using fs.cp(), src or dest pointed to an invalid path.

ERR_HTTP_CONTENT_LENGTH_MISMATCH

Response body size doesn’t match with the specified content-length header value.

ERR_FS_CP_FIFO_PIPE

An attempt was made to copy a named pipe with fs.cp().

ERR_FS_CP_NON_DIR_TO_DIR

An attempt was made to copy a non-directory (file, symlink, etc.) to a directory
using fs.cp().

ERR_FS_CP_SOCKET

An attempt was made to copy to a socket with fs.cp().

ERR_FS_CP_SYMLINK_TO_SUBDIRECTORY

When using fs.cp(), a symlink in dest pointed to a subdirectory
of src.

ERR_FS_CP_UNKNOWN

An attempt was made to copy to an unknown file type with fs.cp().

ERR_FS_EISDIR

Path is a directory.

ERR_FS_FILE_TOO_LARGE

An attempt has been made to read a file whose size is larger than the maximum
allowed size for a Buffer.

ERR_FS_INVALID_SYMLINK_TYPE

An invalid symlink type was passed to the fs.symlink() or
fs.symlinkSync() methods.

ERR_HTTP_HEADERS_SENT

An attempt was made to add more headers after the headers had already been sent.

ERR_HTTP_INVALID_HEADER_VALUE

An invalid HTTP header value was specified.

ERR_HTTP_INVALID_STATUS_CODE

Status code was outside the regular status code range (100-999).

ERR_HTTP_REQUEST_TIMEOUT

The client has not sent the entire request within the allowed time.

ERR_HTTP_SOCKET_ENCODING

Changing the socket encoding is not allowed per RFC 7230 Section 3.

ERR_HTTP_TRAILER_INVALID

The Trailer header was set even though the transfer encoding does not support
that.

ERR_HTTP2_ALTSVC_INVALID_ORIGIN

HTTP/2 ALTSVC frames require a valid origin.

ERR_HTTP2_ALTSVC_LENGTH

HTTP/2 ALTSVC frames are limited to a maximum of 16,382 payload bytes.

ERR_HTTP2_CONNECT_AUTHORITY

For HTTP/2 requests using the CONNECT method, the :authority pseudo-header
is required.

ERR_HTTP2_CONNECT_PATH

For HTTP/2 requests using the CONNECT method, the :path pseudo-header is
forbidden.

ERR_HTTP2_CONNECT_SCHEME

For HTTP/2 requests using the CONNECT method, the :scheme pseudo-header is
forbidden.

ERR_HTTP2_ERROR

A non-specific HTTP/2 error has occurred.

ERR_HTTP2_GOAWAY_SESSION

New HTTP/2 Streams may not be opened after the Http2Session has received a
GOAWAY frame from the connected peer.

ERR_HTTP2_HEADER_SINGLE_VALUE

Multiple values were provided for an HTTP/2 header field that was required to
have only a single value.

ERR_HTTP2_HEADERS_AFTER_RESPOND

An additional headers was specified after an HTTP/2 response was initiated.

ERR_HTTP2_HEADERS_SENT

An attempt was made to send multiple response headers.

ERR_HTTP2_INFO_STATUS_NOT_ALLOWED

Informational HTTP status codes (1xx) may not be set as the response status
code on HTTP/2 responses.

ERR_HTTP2_INVALID_CONNECTION_HEADERS

HTTP/1 connection specific headers are forbidden to be used in HTTP/2
requests and responses.

ERR_HTTP2_INVALID_HEADER_VALUE

An invalid HTTP/2 header value was specified.

ERR_HTTP2_INVALID_INFO_STATUS

An invalid HTTP informational status code has been specified. Informational
status codes must be an integer between 100 and 199 (inclusive).

ERR_HTTP2_INVALID_ORIGIN

HTTP/2 ORIGIN frames require a valid origin.

ERR_HTTP2_INVALID_PACKED_SETTINGS_LENGTH

Input Buffer and Uint8Array instances passed to the
http2.getUnpackedSettings() API must have a length that is a multiple of
six.

ERR_HTTP2_INVALID_PSEUDOHEADER

Only valid HTTP/2 pseudoheaders (:status, :path, :authority, :scheme,
and :method) may be used.

ERR_HTTP2_INVALID_SESSION

An action was performed on an Http2Session object that had already been
destroyed.

ERR_HTTP2_INVALID_SETTING_VALUE

An invalid value has been specified for an HTTP/2 setting.

ERR_HTTP2_INVALID_STREAM

An operation was performed on a stream that had already been destroyed.

ERR_HTTP2_MAX_PENDING_SETTINGS_ACK

Whenever an HTTP/2 SETTINGS frame is sent to a connected peer, the peer is
required to send an acknowledgment that it has received and applied the new
SETTINGS. By default, a maximum number of unacknowledged SETTINGS frames may
be sent at any given time. This error code is used when that limit has been
reached.

ERR_HTTP2_NESTED_PUSH

An attempt was made to initiate a new push stream from within a push stream.
Nested push streams are not permitted.

ERR_HTTP2_NO_MEM

Out of memory when using the http2session.setLocalWindowSize(windowSize) API.

ERR_HTTP2_NO_SOCKET_MANIPULATION

An attempt was made to directly manipulate (read, write, pause, resume, etc.) a
socket attached to an Http2Session.

ERR_HTTP2_ORIGIN_LENGTH

HTTP/2 ORIGIN frames are limited to a length of 16382 bytes.

ERR_HTTP2_OUT_OF_STREAMS

The number of streams created on a single HTTP/2 session reached the maximum
limit.

ERR_HTTP2_PAYLOAD_FORBIDDEN

A message payload was specified for an HTTP response code for which a payload is
forbidden.

ERR_HTTP2_PING_CANCEL

An HTTP/2 ping was canceled.

ERR_HTTP2_PING_LENGTH

HTTP/2 ping payloads must be exactly 8 bytes in length.

ERR_HTTP2_PSEUDOHEADER_NOT_ALLOWED

An HTTP/2 pseudo-header has been used inappropriately. Pseudo-headers are header
key names that begin with the : prefix.

ERR_HTTP2_PUSH_DISABLED

An attempt was made to create a push stream, which had been disabled by the
client.

ERR_HTTP2_SEND_FILE

An attempt was made to use the Http2Stream.prototype.responseWithFile() API to
send a directory.

ERR_HTTP2_SEND_FILE_NOSEEK

An attempt was made to use the Http2Stream.prototype.responseWithFile() API to
send something other than a regular file, but offset or length options were
provided.

ERR_HTTP2_SESSION_ERROR

The Http2Session closed with a non-zero error code.

ERR_HTTP2_SETTINGS_CANCEL

The Http2Session settings canceled.

ERR_HTTP2_SOCKET_BOUND

An attempt was made to connect a Http2Session object to a net.Socket or
tls.TLSSocket that had already been bound to another Http2Session object.

ERR_HTTP2_SOCKET_UNBOUND

An attempt was made to use the socket property of an Http2Session that
has already been closed.

ERR_HTTP2_STATUS_101

Use of the 101 Informational status code is forbidden in HTTP/2.

ERR_HTTP2_STATUS_INVALID

An invalid HTTP status code has been specified. Status codes must be an integer
between 100 and 599 (inclusive).

ERR_HTTP2_STREAM_CANCEL

An Http2Stream was destroyed before any data was transmitted to the connected
peer.

ERR_HTTP2_STREAM_ERROR

A non-zero error code was been specified in an RST_STREAM frame.

ERR_HTTP2_STREAM_SELF_DEPENDENCY

When setting the priority for an HTTP/2 stream, the stream may be marked as
a dependency for a parent stream. This error code is used when an attempt is
made to mark a stream and dependent of itself.

ERR_HTTP2_TOO_MANY_INVALID_FRAMES

The limit of acceptable invalid HTTP/2 protocol frames sent by the peer,
as specified through the maxSessionInvalidFrames option, has been exceeded.

ERR_HTTP2_TRAILERS_ALREADY_SENT

Trailing headers have already been sent on the Http2Stream.

ERR_HTTP2_TRAILERS_NOT_READY

The http2stream.sendTrailers() method cannot be called until after the
'wantTrailers' event is emitted on an Http2Stream object. The
'wantTrailers' event will only be emitted if the waitForTrailers option
is set for the Http2Stream.

ERR_HTTP2_UNSUPPORTED_PROTOCOL

http2.connect() was passed a URL that uses any protocol other than http: or
https:.

ERR_ILLEGAL_CONSTRUCTOR

An attempt was made to construct an object using a non-public constructor.

ERR_IMPORT_ASSERTION_TYPE_FAILED

An import assertion has failed, preventing the specified module to be imported.

ERR_IMPORT_ASSERTION_TYPE_MISSING

An import assertion is missing, preventing the specified module to be imported.

ERR_IMPORT_ASSERTION_TYPE_UNSUPPORTED

An import assertion is not supported by this version of Node.js.

ERR_INCOMPATIBLE_OPTION_PAIR

An option pair is incompatible with each other and cannot be used at the same
time.

ERR_INPUT_TYPE_NOT_ALLOWED

Stability: 1 — Experimental

The --input-type flag was used to attempt to execute a file. This flag can
only be used with input via --eval, --print, or STDIN.

ERR_INSPECTOR_ALREADY_ACTIVATED

While using the node:inspector module, an attempt was made to activate the
inspector when it already started to listen on a port. Use inspector.close()
before activating it on a different address.

ERR_INSPECTOR_ALREADY_CONNECTED

While using the node:inspector module, an attempt was made to connect when the
inspector was already connected.

ERR_INSPECTOR_CLOSED

While using the node:inspector module, an attempt was made to use the
inspector after the session had already closed.

ERR_INSPECTOR_COMMAND

An error occurred while issuing a command via the node:inspector module.

ERR_INSPECTOR_NOT_ACTIVE

The inspector is not active when inspector.waitForDebugger() is called.

ERR_INSPECTOR_NOT_AVAILABLE

The node:inspector module is not available for use.

ERR_INSPECTOR_NOT_CONNECTED

While using the node:inspector module, an attempt was made to use the
inspector before it was connected.

ERR_INSPECTOR_NOT_WORKER

An API was called on the main thread that can only be used from
the worker thread.

ERR_INTERNAL_ASSERTION

There was a bug in Node.js or incorrect usage of Node.js internals.
To fix the error, open an issue at https://github.com/nodejs/node/issues.

ERR_INVALID_ADDRESS_FAMILY

The provided address family is not understood by the Node.js API.

ERR_INVALID_ARG_TYPE

An argument of the wrong type was passed to a Node.js API.

ERR_INVALID_ARG_VALUE

An invalid or unsupported value was passed for a given argument.

ERR_INVALID_ASYNC_ID

An invalid asyncId or triggerAsyncId was passed using AsyncHooks. An id
less than -1 should never happen.

ERR_INVALID_BUFFER_SIZE

A swap was performed on a Buffer but its size was not compatible with the
operation.

ERR_INVALID_CHAR

Invalid characters were detected in headers.

ERR_INVALID_CURSOR_POS

A cursor on a given stream cannot be moved to a specified row without a
specified column.

ERR_INVALID_FD

A file descriptor (‘fd’) was not valid (e.g. it was a negative value).

ERR_INVALID_FD_TYPE

A file descriptor (‘fd’) type was not valid.

ERR_INVALID_FILE_URL_HOST

A Node.js API that consumes file: URLs (such as certain functions in the
fs module) encountered a file URL with an incompatible host. This
situation can only occur on Unix-like systems where only localhost or an empty
host is supported.

ERR_INVALID_FILE_URL_PATH

A Node.js API that consumes file: URLs (such as certain functions in the
fs module) encountered a file URL with an incompatible path. The exact
semantics for determining whether a path can be used is platform-dependent.

ERR_INVALID_HANDLE_TYPE

An attempt was made to send an unsupported «handle» over an IPC communication
channel to a child process. See subprocess.send() and process.send()
for more information.

ERR_INVALID_HTTP_TOKEN

An invalid HTTP token was supplied.

ERR_INVALID_IP_ADDRESS

An IP address is not valid.

ERR_INVALID_MIME_SYNTAX

The syntax of a MIME is not valid.

ERR_INVALID_MODULE

An attempt was made to load a module that does not exist or was otherwise not
valid.

ERR_INVALID_MODULE_SPECIFIER

The imported module string is an invalid URL, package name, or package subpath
specifier.

ERR_INVALID_OBJECT_DEFINE_PROPERTY

An error occurred while setting an invalid attribute on the property of
an object.

ERR_INVALID_PACKAGE_CONFIG

An invalid package.json file failed parsing.

ERR_INVALID_PACKAGE_TARGET

The package.json "exports" field contains an invalid target mapping
value for the attempted module resolution.

ERR_INVALID_PERFORMANCE_MARK

While using the Performance Timing API (perf_hooks), a performance mark is
invalid.

ERR_INVALID_PROTOCOL

An invalid options.protocol was passed to http.request().

ERR_INVALID_REPL_EVAL_CONFIG

Both breakEvalOnSigint and eval options were set in the REPL config,
which is not supported.

ERR_INVALID_REPL_INPUT

The input may not be used in the REPL. The conditions under which this
error is used are described in the REPL documentation.

ERR_INVALID_RETURN_PROPERTY

Thrown in case a function option does not provide a valid value for one of its
returned object properties on execution.

ERR_INVALID_RETURN_PROPERTY_VALUE

Thrown in case a function option does not provide an expected value
type for one of its returned object properties on execution.

ERR_INVALID_RETURN_VALUE

Thrown in case a function option does not return an expected value
type on execution, such as when a function is expected to return a promise.

ERR_INVALID_STATE

Indicates that an operation cannot be completed due to an invalid state.
For instance, an object may have already been destroyed, or may be
performing another operation.

ERR_INVALID_SYNC_FORK_INPUT

A Buffer, TypedArray, DataView, or string was provided as stdio input to
an asynchronous fork. See the documentation for the child_process module
for more information.

ERR_INVALID_THIS

A Node.js API function was called with an incompatible this value.

const urlSearchParams = new URLSearchParams('foo=bar&baz=new');

const buf = Buffer.alloc(1);
urlSearchParams.has.call(buf, 'foo');
// Throws a TypeError with code 'ERR_INVALID_THIS'

ERR_INVALID_TRANSFER_OBJECT

An invalid transfer object was passed to postMessage().

ERR_INVALID_TUPLE

An element in the iterable provided to the WHATWG
URLSearchParams constructor did not
represent a [name, value] tuple – that is, if an element is not iterable, or
does not consist of exactly two elements.

ERR_INVALID_URI

An invalid URI was passed.

ERR_INVALID_URL

An invalid URL was passed to the WHATWG URL
constructor or the legacy url.parse() to be parsed.
The thrown error object typically has an additional property 'input' that
contains the URL that failed to parse.

ERR_INVALID_URL_SCHEME

An attempt was made to use a URL of an incompatible scheme (protocol) for a
specific purpose. It is only used in the WHATWG URL API support in the
fs module (which only accepts URLs with 'file' scheme), but may be used
in other Node.js APIs as well in the future.

ERR_IPC_CHANNEL_CLOSED

An attempt was made to use an IPC communication channel that was already closed.

ERR_IPC_DISCONNECTED

An attempt was made to disconnect an IPC communication channel that was already
disconnected. See the documentation for the child_process module
for more information.

ERR_IPC_ONE_PIPE

An attempt was made to create a child Node.js process using more than one IPC
communication channel. See the documentation for the child_process module
for more information.

ERR_IPC_SYNC_FORK

An attempt was made to open an IPC communication channel with a synchronously
forked Node.js process. See the documentation for the child_process module
for more information.

ERR_LOADER_CHAIN_INCOMPLETE

An ESM loader hook returned without calling next() and without explicitly
signaling a short circuit.

ERR_MANIFEST_ASSERT_INTEGRITY

An attempt was made to load a resource, but the resource did not match the
integrity defined by the policy manifest. See the documentation for policy
manifests for more information.

ERR_MANIFEST_DEPENDENCY_MISSING

An attempt was made to load a resource, but the resource was not listed as a
dependency from the location that attempted to load it. See the documentation
for policy manifests for more information.

ERR_MANIFEST_INTEGRITY_MISMATCH

An attempt was made to load a policy manifest, but the manifest had multiple
entries for a resource which did not match each other. Update the manifest
entries to match in order to resolve this error. See the documentation for
policy manifests for more information.

ERR_MANIFEST_INVALID_RESOURCE_FIELD

A policy manifest resource had an invalid value for one of its fields. Update
the manifest entry to match in order to resolve this error. See the
documentation for policy manifests for more information.

ERR_MANIFEST_INVALID_SPECIFIER

A policy manifest resource had an invalid value for one of its dependency
mappings. Update the manifest entry to match to resolve this error. See the
documentation for policy manifests for more information.

ERR_MANIFEST_PARSE_POLICY

An attempt was made to load a policy manifest, but the manifest was unable to
be parsed. See the documentation for policy manifests for more information.

ERR_MANIFEST_TDZ

An attempt was made to read from a policy manifest, but the manifest
initialization has not yet taken place. This is likely a bug in Node.js.

ERR_MANIFEST_UNKNOWN_ONERROR

A policy manifest was loaded, but had an unknown value for its «onerror»
behavior. See the documentation for policy manifests for more information.

ERR_MEMORY_ALLOCATION_FAILED

An attempt was made to allocate memory (usually in the C++ layer) but it
failed.

ERR_MESSAGE_TARGET_CONTEXT_UNAVAILABLE

A message posted to a MessagePort could not be deserialized in the target
vm Context. Not all Node.js objects can be successfully instantiated in
any context at this time, and attempting to transfer them using postMessage()
can fail on the receiving side in that case.

ERR_METHOD_NOT_IMPLEMENTED

A method is required but not implemented.

ERR_MISSING_ARGS

A required argument of a Node.js API was not passed. This is only used for
strict compliance with the API specification (which in some cases may accept
func(undefined) but not func()). In most native Node.js APIs,
func(undefined) and func() are treated identically, and the
ERR_INVALID_ARG_TYPE error code may be used instead.

ERR_MISSING_OPTION

For APIs that accept options objects, some options might be mandatory. This code
is thrown if a required option is missing.

ERR_MISSING_PASSPHRASE

An attempt was made to read an encrypted key without specifying a passphrase.

ERR_MISSING_PLATFORM_FOR_WORKER

The V8 platform used by this instance of Node.js does not support creating
Workers. This is caused by lack of embedder support for Workers. In particular,
this error will not occur with standard builds of Node.js.

ERR_MISSING_TRANSFERABLE_IN_TRANSFER_LIST

An object that needs to be explicitly listed in the transferList argument
is in the object passed to a postMessage() call, but is not provided
in the transferList for that call. Usually, this is a MessagePort.

In Node.js versions prior to v15.0.0, the error code being used here was
ERR_MISSING_MESSAGE_PORT_IN_TRANSFER_LIST. However, the set of
transferable object types has been expanded to cover more types than
MessagePort.

ERR_MODULE_NOT_FOUND

A module file could not be resolved by the ECMAScript modules loader while
attempting an import operation or when loading the program entry point.

ERR_MULTIPLE_CALLBACK

A callback was called more than once.

A callback is almost always meant to only be called once as the query
can either be fulfilled or rejected but not both at the same time. The latter
would be possible by calling a callback more than once.

ERR_NAPI_CONS_FUNCTION

While using Node-API, a constructor passed was not a function.

ERR_NAPI_INVALID_DATAVIEW_ARGS

While calling napi_create_dataview(), a given offset was outside the bounds
of the dataview or offset + length was larger than a length of given buffer.

ERR_NAPI_INVALID_TYPEDARRAY_ALIGNMENT

While calling napi_create_typedarray(), the provided offset was not a
multiple of the element size.

ERR_NAPI_INVALID_TYPEDARRAY_LENGTH

While calling napi_create_typedarray(), (length * size_of_element) + byte_offset was larger than the length of given buffer.

ERR_NAPI_TSFN_CALL_JS

An error occurred while invoking the JavaScript portion of the thread-safe
function.

ERR_NAPI_TSFN_GET_UNDEFINED

An error occurred while attempting to retrieve the JavaScript undefined
value.

ERR_NAPI_TSFN_START_IDLE_LOOP

On the main thread, values are removed from the queue associated with the
thread-safe function in an idle loop. This error indicates that an error
has occurred when attempting to start the loop.

ERR_NAPI_TSFN_STOP_IDLE_LOOP

Once no more items are left in the queue, the idle loop must be suspended. This
error indicates that the idle loop has failed to stop.

ERR_NOT_BUILDING_SNAPSHOT

An attempt was made to use operations that can only be used when building
V8 startup snapshot even though Node.js isn’t building one.

ERR_NO_CRYPTO

An attempt was made to use crypto features while Node.js was not compiled with
OpenSSL crypto support.

ERR_NO_ICU

An attempt was made to use features that require ICU, but Node.js was not
compiled with ICU support.

ERR_NON_CONTEXT_AWARE_DISABLED

A non-context-aware native addon was loaded in a process that disallows them.

ERR_OUT_OF_RANGE

A given value is out of the accepted range.

ERR_PACKAGE_IMPORT_NOT_DEFINED

The package.json "imports" field does not define the given internal
package specifier mapping.

ERR_PACKAGE_PATH_NOT_EXPORTED

The package.json "exports" field does not export the requested subpath.
Because exports are encapsulated, private internal modules that are not exported
cannot be imported through the package resolution, unless using an absolute URL.

ERR_PARSE_ARGS_INVALID_OPTION_VALUE

When strict set to true, thrown by util.parseArgs() if a {boolean}
value is provided for an option of type {string}, or if a {string}
value is provided for an option of type {boolean}.

ERR_PARSE_ARGS_UNEXPECTED_POSITIONAL

Thrown by util.parseArgs(), when a positional argument is provided and
allowPositionals is set to false.

ERR_PARSE_ARGS_UNKNOWN_OPTION

When strict set to true, thrown by util.parseArgs() if an argument
is not configured in options.

ERR_PERFORMANCE_INVALID_TIMESTAMP

An invalid timestamp value was provided for a performance mark or measure.

ERR_PERFORMANCE_MEASURE_INVALID_OPTIONS

Invalid options were provided for a performance measure.

ERR_PROTO_ACCESS

Accessing Object.prototype.__proto__ has been forbidden using
--disable-proto=throw. Object.getPrototypeOf and
Object.setPrototypeOf should be used to get and set the prototype of an
object.

ERR_REQUIRE_ESM

Stability: 1 — Experimental

An attempt was made to require() an ES Module.

ERR_SCRIPT_EXECUTION_INTERRUPTED

Script execution was interrupted by SIGINT (For
example, Ctrl+C was pressed.)

ERR_SCRIPT_EXECUTION_TIMEOUT

Script execution timed out, possibly due to bugs in the script being executed.

ERR_SERVER_ALREADY_LISTEN

The server.listen() method was called while a net.Server was already
listening. This applies to all instances of net.Server, including HTTP, HTTPS,
and HTTP/2 Server instances.

ERR_SERVER_NOT_RUNNING

The server.close() method was called when a net.Server was not
running. This applies to all instances of net.Server, including HTTP, HTTPS,
and HTTP/2 Server instances.

ERR_SOCKET_ALREADY_BOUND

An attempt was made to bind a socket that has already been bound.

ERR_SOCKET_BAD_BUFFER_SIZE

An invalid (negative) size was passed for either the recvBufferSize or
sendBufferSize options in dgram.createSocket().

ERR_SOCKET_BAD_PORT

An API function expecting a port >= 0 and < 65536 received an invalid value.

ERR_SOCKET_BAD_TYPE

An API function expecting a socket type (udp4 or udp6) received an invalid
value.

ERR_SOCKET_BUFFER_SIZE

While using dgram.createSocket(), the size of the receive or send Buffer
could not be determined.

ERR_SOCKET_CLOSED

An attempt was made to operate on an already closed socket.

ERR_SOCKET_CLOSED_BEFORE_CONNECTION

When calling net.Socket.write() on a connecting socket and the socket was
closed before the connection was established.

ERR_SOCKET_DGRAM_IS_CONNECTED

A dgram.connect() call was made on an already connected socket.

ERR_SOCKET_DGRAM_NOT_CONNECTED

A dgram.disconnect() or dgram.remoteAddress() call was made on a
disconnected socket.

ERR_SOCKET_DGRAM_NOT_RUNNING

A call was made and the UDP subsystem was not running.

ERR_SRI_PARSE

A string was provided for a Subresource Integrity check, but was unable to be
parsed. Check the format of integrity attributes by looking at the
Subresource Integrity specification.

ERR_STREAM_ALREADY_FINISHED

A stream method was called that cannot complete because the stream was
finished.

ERR_STREAM_CANNOT_PIPE

An attempt was made to call stream.pipe() on a Writable stream.

ERR_STREAM_DESTROYED

A stream method was called that cannot complete because the stream was
destroyed using stream.destroy().

ERR_STREAM_NULL_VALUES

An attempt was made to call stream.write() with a null chunk.

ERR_STREAM_PREMATURE_CLOSE

An error returned by stream.finished() and stream.pipeline(), when a stream
or a pipeline ends non gracefully with no explicit error.

ERR_STREAM_PUSH_AFTER_EOF

An attempt was made to call stream.push() after a null(EOF) had been
pushed to the stream.

ERR_STREAM_UNSHIFT_AFTER_END_EVENT

An attempt was made to call stream.unshift() after the 'end' event was
emitted.

ERR_STREAM_WRAP

Prevents an abort if a string decoder was set on the Socket or if the decoder
is in objectMode.

const Socket = require('node:net').Socket;
const instance = new Socket();

instance.setEncoding('utf8');

ERR_STREAM_WRITE_AFTER_END

An attempt was made to call stream.write() after stream.end() has been
called.

ERR_STRING_TOO_LONG

An attempt has been made to create a string longer than the maximum allowed
length.

ERR_SYNTHETIC

An artificial error object used to capture the call stack for diagnostic
reports.

ERR_SYSTEM_ERROR

An unspecified or non-specific system error has occurred within the Node.js
process. The error object will have an err.info object property with
additional details.

ERR_TAP_LEXER_ERROR

An error representing a failing lexer state.

ERR_TAP_PARSER_ERROR

An error representing a failing parser state. Additional information about
the token causing the error is available via the cause property.

ERR_TAP_VALIDATION_ERROR

This error represents a failed TAP validation.

ERR_TEST_FAILURE

This error represents a failed test. Additional information about the failure
is available via the cause property. The failureType property specifies
what the test was doing when the failure occurred.

ERR_TLS_CERT_ALTNAME_FORMAT

This error is thrown by checkServerIdentity if a user-supplied
subjectaltname property violates encoding rules. Certificate objects produced
by Node.js itself always comply with encoding rules and will never cause
this error.

ERR_TLS_CERT_ALTNAME_INVALID

While using TLS, the host name/IP of the peer did not match any of the
subjectAltNames in its certificate.

ERR_TLS_DH_PARAM_SIZE

While using TLS, the parameter offered for the Diffie-Hellman (DH)
key-agreement protocol is too small. By default, the key length must be greater
than or equal to 1024 bits to avoid vulnerabilities, even though it is strongly
recommended to use 2048 bits or larger for stronger security.

ERR_TLS_HANDSHAKE_TIMEOUT

A TLS/SSL handshake timed out. In this case, the server must also abort the
connection.

ERR_TLS_INVALID_CONTEXT

The context must be a SecureContext.

ERR_TLS_INVALID_PROTOCOL_METHOD

The specified secureProtocol method is invalid. It is either unknown, or
disabled because it is insecure.

ERR_TLS_INVALID_PROTOCOL_VERSION

Valid TLS protocol versions are 'TLSv1', 'TLSv1.1', or 'TLSv1.2'.

ERR_TLS_INVALID_STATE

The TLS socket must be connected and securely established. Ensure the ‘secure’
event is emitted before continuing.

ERR_TLS_PROTOCOL_VERSION_CONFLICT

Attempting to set a TLS protocol minVersion or maxVersion conflicts with an
attempt to set the secureProtocol explicitly. Use one mechanism or the other.

ERR_TLS_PSK_SET_IDENTIY_HINT_FAILED

Failed to set PSK identity hint. Hint may be too long.

ERR_TLS_RENEGOTIATION_DISABLED

An attempt was made to renegotiate TLS on a socket instance with renegotiation
disabled.

ERR_TLS_REQUIRED_SERVER_NAME

While using TLS, the server.addContext() method was called without providing
a host name in the first parameter.

ERR_TLS_SESSION_ATTACK

An excessive amount of TLS renegotiations is detected, which is a potential
vector for denial-of-service attacks.

ERR_TLS_SNI_FROM_SERVER

An attempt was made to issue Server Name Indication from a TLS server-side
socket, which is only valid from a client.

ERR_TRACE_EVENTS_CATEGORY_REQUIRED

The trace_events.createTracing() method requires at least one trace event
category.

ERR_TRACE_EVENTS_UNAVAILABLE

The node:trace_events module could not be loaded because Node.js was compiled
with the --without-v8-platform flag.

ERR_TRANSFORM_ALREADY_TRANSFORMING

A Transform stream finished while it was still transforming.

ERR_TRANSFORM_WITH_LENGTH_0

A Transform stream finished with data still in the write buffer.

ERR_TTY_INIT_FAILED

The initialization of a TTY failed due to a system error.

ERR_UNAVAILABLE_DURING_EXIT

Function was called within a process.on('exit') handler that shouldn’t be
called within process.on('exit') handler.

ERR_UNCAUGHT_EXCEPTION_CAPTURE_ALREADY_SET

process.setUncaughtExceptionCaptureCallback() was called twice,
without first resetting the callback to null.

This error is designed to prevent accidentally overwriting a callback registered
from another module.

ERR_UNESCAPED_CHARACTERS

A string that contained unescaped characters was received.

ERR_UNHANDLED_ERROR

An unhandled error occurred (for instance, when an 'error' event is emitted
by an EventEmitter but an 'error' handler is not registered).

ERR_UNKNOWN_BUILTIN_MODULE

Used to identify a specific kind of internal Node.js error that should not
typically be triggered by user code. Instances of this error point to an
internal bug within the Node.js binary itself.

ERR_UNKNOWN_CREDENTIAL

A Unix group or user identifier that does not exist was passed.

ERR_UNKNOWN_ENCODING

An invalid or unknown encoding option was passed to an API.

ERR_UNKNOWN_FILE_EXTENSION

Stability: 1 — Experimental

An attempt was made to load a module with an unknown or unsupported file
extension.

ERR_UNKNOWN_MODULE_FORMAT

Stability: 1 — Experimental

An attempt was made to load a module with an unknown or unsupported format.

ERR_UNKNOWN_SIGNAL

An invalid or unknown process signal was passed to an API expecting a valid
signal (such as subprocess.kill()).

ERR_UNSUPPORTED_DIR_IMPORT

import a directory URL is unsupported. Instead,
self-reference a package using its name and define a custom subpath in
the "exports" field of the package.json file.

import './'; // unsupported
import './index.js'; // supported
import 'package-name'; // supported

ERR_UNSUPPORTED_ESM_URL_SCHEME

import with URL schemes other than file and data is unsupported.

ERR_USE_AFTER_CLOSE

Stability: 1 — Experimental

An attempt was made to use something that was already closed.

ERR_VALID_PERFORMANCE_ENTRY_TYPE

While using the Performance Timing API (perf_hooks), no valid performance
entry types are found.

ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING

A dynamic import callback was not specified.

ERR_VM_MODULE_ALREADY_LINKED

The module attempted to be linked is not eligible for linking, because of one of
the following reasons:

• It has already been linked (linkingStatus is 'linked')
• It is being linked (linkingStatus is 'linking')
• Linking has failed for this module (linkingStatus is 'errored')

ERR_VM_MODULE_CACHED_DATA_REJECTED

The cachedData option passed to a module constructor is invalid.

ERR_VM_MODULE_CANNOT_CREATE_CACHED_DATA

Cached data cannot be created for modules which have already been evaluated.

ERR_VM_MODULE_DIFFERENT_CONTEXT

The module being returned from the linker function is from a different context
than the parent module. Linked modules must share the same context.

ERR_VM_MODULE_LINK_FAILURE

The module was unable to be linked due to a failure.

ERR_VM_MODULE_NOT_MODULE

The fulfilled value of a linking promise is not a vm.Module object.

ERR_VM_MODULE_STATUS

The current module’s status does not allow for this operation. The specific
meaning of the error depends on the specific function.

ERR_WASI_ALREADY_STARTED

The WASI instance has already started.

ERR_WASI_NOT_STARTED

The WASI instance has not been started.

ERR_WEBASSEMBLY_RESPONSE

The Response that has been passed to WebAssembly.compileStreaming or to
WebAssembly.instantiateStreaming is not a valid WebAssembly response.

ERR_WORKER_INIT_FAILED

The Worker initialization failed.

ERR_WORKER_INVALID_EXEC_ARGV

The execArgv option passed to the Worker constructor contains
invalid flags.

ERR_WORKER_NOT_RUNNING

An operation failed because the Worker instance is not currently running.

ERR_WORKER_OUT_OF_MEMORY

The Worker instance terminated because it reached its memory limit.

ERR_WORKER_PATH

The path for the main script of a worker is neither an absolute path
nor a relative path starting with ./ or ../.

ERR_WORKER_UNSERIALIZABLE_ERROR

All attempts at serializing an uncaught exception from a worker thread failed.

ERR_WORKER_UNSUPPORTED_OPERATION

The requested functionality is not supported in worker threads.

ERR_ZLIB_INITIALIZATION_FAILED

Creation of a zlib object failed due to incorrect configuration.

HPE_HEADER_OVERFLOW

Too much HTTP header data was received. In order to protect against malicious or
malconfigured clients, if more than 8 KiB of HTTP header data is received then
HTTP parsing will abort without a request or response object being created, and
an Error with this code will be emitted.

HPE_UNEXPECTED_CONTENT_LENGTH

Server is sending both a Content-Length header and Transfer-Encoding: chunked.

Transfer-Encoding: chunked allows the server to maintain an HTTP persistent
connection for dynamically generated content.
In this case, the Content-Length HTTP header cannot be used.

Use Content-Length or Transfer-Encoding: chunked.

MODULE_NOT_FOUND

A module file could not be resolved by the CommonJS modules loader while
attempting a require() operation or when loading the program entry point.

Legacy Node.js error codes

Stability: 0 — Deprecated. These error codes are either inconsistent, or have
been removed.

ERR_CANNOT_TRANSFER_OBJECT

The value passed to postMessage() contained an object that is not supported
for transferring.

ERR_CRYPTO_HASH_DIGEST_NO_UTF16

The UTF-16 encoding was used with hash.digest(). While the
hash.digest() method does allow an encoding argument to be passed in,
causing the method to return a string rather than a Buffer, the UTF-16
encoding (e.g. ucs or utf16le) is not supported.

ERR_HTTP2_FRAME_ERROR

Used when a failure occurs sending an individual frame on the HTTP/2
session.

ERR_HTTP2_HEADERS_OBJECT

Used when an HTTP/2 Headers Object is expected.

ERR_HTTP2_HEADER_REQUIRED

Used when a required header is missing in an HTTP/2 message.

ERR_HTTP2_INFO_HEADERS_AFTER_RESPOND

HTTP/2 informational headers must only be sent prior to calling the
Http2Stream.prototype.respond() method.

ERR_HTTP2_STREAM_CLOSED

Used when an action has been performed on an HTTP/2 Stream that has already
been closed.

ERR_HTTP_INVALID_CHAR

Used when an invalid character is found in an HTTP response status message
(reason phrase).

ERR_INDEX_OUT_OF_RANGE

A given index was out of the accepted range (e.g. negative offsets).

ERR_INVALID_OPT_VALUE

An invalid or unexpected value was passed in an options object.

ERR_INVALID_OPT_VALUE_ENCODING

An invalid or unknown file encoding was passed.

ERR_MISSING_MESSAGE_PORT_IN_TRANSFER_LIST

This error code was replaced by ERR_MISSING_TRANSFERABLE_IN_TRANSFER_LIST
in Node.js v15.0.0, because it is no longer accurate as other types of
transferable objects also exist now.

ERR_NAPI_CONS_PROTOTYPE_OBJECT

Used by the Node-API when Constructor.prototype is not an object.

ERR_NETWORK_IMPORT_BAD_RESPONSE

Stability: 1 — Experimental

Response was received but was invalid when importing a module over the network.

ERR_NETWORK_IMPORT_DISALLOWED

Stability: 1 — Experimental

A network module attempted to load another module that it is not allowed to
load. Likely this restriction is for security reasons.

ERR_NO_LONGER_SUPPORTED

A Node.js API was called in an unsupported manner, such as
Buffer.write(string, encoding, offset[, length]).

ERR_OPERATION_FAILED

An operation failed. This is typically used to signal the general failure
of an asynchronous operation.

ERR_OUTOFMEMORY

Used generically to identify that an operation caused an out of memory
condition.

ERR_PARSE_HISTORY_DATA

The node:repl module was unable to parse data from the REPL history file.

ERR_SOCKET_CANNOT_SEND

Data could not be sent on a socket.

ERR_STDERR_CLOSE

An attempt was made to close the process.stderr stream. By design, Node.js
does not allow stdout or stderr streams to be closed by user code.

ERR_STDOUT_CLOSE

An attempt was made to close the process.stdout stream. By design, Node.js
does not allow stdout or stderr streams to be closed by user code.

ERR_STREAM_READ_NOT_IMPLEMENTED

Used when an attempt is made to use a readable stream that has not implemented
readable._read().

ERR_TLS_RENEGOTIATION_FAILED

Used when a TLS renegotiation request has failed in a non-specific way.

ERR_TRANSFERRING_EXTERNALIZED_SHAREDARRAYBUFFER

A SharedArrayBuffer whose memory is not managed by the JavaScript engine
or by Node.js was encountered during serialization. Such a SharedArrayBuffer
cannot be serialized.

This can only happen when native addons create SharedArrayBuffers in
«externalized» mode, or put existing SharedArrayBuffer into externalized mode.

ERR_UNKNOWN_STDIN_TYPE

An attempt was made to launch a Node.js process with an unknown stdin file
type. This error is usually an indication of a bug within Node.js itself,
although it is possible for user code to trigger it.

ERR_UNKNOWN_STREAM_TYPE

An attempt was made to launch a Node.js process with an unknown stdout or
stderr file type. This error is usually an indication of a bug within Node.js
itself, although it is possible for user code to trigger it.

ERR_V8BREAKITERATOR

The V8 BreakIterator API was used but the full ICU data set is not installed.

ERR_VALUE_OUT_OF_RANGE

Used when a given value is out of the accepted range.

ERR_VM_MODULE_NOT_LINKED

The module must be successfully linked before instantiation.

ERR_VM_MODULE_LINKING_ERRORED

The linker function returned a module for which linking has failed.

ERR_WORKER_UNSUPPORTED_EXTENSION

The pathname used for the main script of a worker has an
unknown file extension.

ERR_ZLIB_BINDING_CLOSED

Used when an attempt is made to use a zlib object after it has already been
closed.

ERR_CPU_USAGE

The native call from process.cpuUsage could not be processed.