Error cannot find module jsonwebtoken

i am trying to set up an user level authentication using node.js, so i go and do npm install -g jsonwebtoken —save. However, i run into problems when i use require(‘jsonwebtoken’); and try to compile my code, it gives me the error described above in the title. Now, for some reason, when i uninstall the JWT and try to run my code without it, it compiles, but obviously it doesn’t work. I tried re-installing it, still no success.
My npm —version
6.3.0

node —version
v11.1.0

npm install -g jsonwebtoken —save
+ jsonwebtoken@8.4.0

code:

'use strict';

require('jsonwebtoken');

exports.generateToken = async (data) => {
    return jwt.sign(data, global.SALT_KEY, { expiresIn: '1d' });
}

exports.decodeToken = async (token) => {
    var data = await jwt.verify(token, global.SALT_KEY);
    return data;
}

exports.authorize = function (req, res, next) {
    var token = req.body.token || req.query.token || req.headers['x-access-token'];

    if (!token) {
        res.status(401).json({
            message: 'Acesso Restrito'
        });
    } else {
        jwt.verify(token, global.SALT_KEY, function (error, decoded) {
            if (error) {
                res.status(401).json({
                    message: 'Token Inválido'
                });
            } else {
                next();
            }
        });
    }
};

exports.isAdmin = function (req, res, next) {
    var token = req.body.token || req.query.token || req.headers['x-access-token'];

    if (!token) {
        res.status(401).json({
            message: 'Token Inválido'
        });
    } else {
        jwt.verify(token, global.SALT_KEY, function (error, decoded) {
            if (error) {
                res.status(401).json({
                    message: 'Token Inválido'
                });
            } else {
                if (decoded.roles.includes('admin')) {
                    next();
                } else {
                    res.status(403).json({
                        message: 'Esta funcionalidade é restrita para administradores'
                    });
                }
            }
        });
    }
};

Hello!

I’ve been working on a personal project, and I’m currently trying to implement JWT authentication (following this tutorial: https://www.youtube.com/watch?v=LKlO8vLvUao&t=5544s) but unfortunately I keep running into the following error:

internal/modules/cjs/loader.js:895throw err;Error: Cannot find module 'jsonwebtoken'

Require stack:- /app/controllers/users.js- /app/routes/users.js- /app/index.js

The imports in my /app/controllers/users.js file are as follows:

const jwt = require('jsonwebtoken');const bcrypt = require('bcryptjs');const User = require('../models/user.js');

When I swap the order of the jwt and bcrypt import, then the error message changes to reflect that (i.e., it cannot find module ‘bcryptjs’ if that is first). However, there are no issues when importing my own models/user.js file.

I have uninstalled and re-installed the node_modules folder several times, and my package.json file seems to be totally fine (I think):{"name": "server","version": "1.0.0","description": "","main": "index.js","scripts": {"start": "nodemon index.js","test": "echo "Error: no test specified" && exit 1"},"keywords": [],"author": "","license": "ISC","dependencies": {"bcryptjs": "^2.4.3","body-parser": "^1.19.0","cors": "^2.8.5","express": "^4.17.1","jsonwebtoken": "^8.5.1","mongoose": "^5.12.3","nodemon": "^2.0.7"}}

Apologies for the wall of text — any ideas? I’ve scoured dozens of SO posts, but unfortunately to no avail.

Thank you!

UPDATE: I think it may be something to do with docker/docker-compose. When I run npm start in my server directory, I no longer get a ‘Cannot find module’ error. I only get it after running docker-compose up. I still haven’t figured out a fix yet though.

UPDATE #2 (for anyone from the future with this issue): I finally fixed it. Instead of just doing docker-compose build followed by docker-compose up, do the following sequence:
docker-compose build
docker-compose down -v <— This removes all volumes
docker-compose up

Thanks to M3RS from https://stackoverflow.com/questions/42040317/cannot-find-module-for-a-node-js-app-running-in-a-docker-compose-environment for the solution.

Good day! I am testing an AWS Lambda Function that uses an AWS Lambda Layer with the following directory:

LambdaLayer.zip
  nodejs/
    package.json
    package-lock.json
    node_modules/
      jsonwebtoken/

In my Lambda Function (running on node 14.x runtime), I am importing the module from the layer like this:

const jwt = require('jsonwebtoken');

However, I am getting the following error:

ERROR   Uncaught Exception {"errorType":"Runtime.ImportModuleError","errorMessage":"Error: Cannot find module 'jsonwebtoken'nRequire stack:n- /var/task/index.jsn- /var/runtime/UserFunction.jsn- /var/runtime/index.js","stack":["Runtime.ImportModuleError: Error: Cannot find module 'jsonwebtoken'","Require stack:","- /var/task/index.js","- /var/runtime/UserFunction.js","- /var/runtime/index.js","

I already followed the directory structure as per AWS documentation and as also stated here: AWS lambda layers error when call API «cannot find module». Still, I’m getting this error.

I also tried the below directory structure but still did not work:

LambdaLayer.zip
  nodejs/
    node14/
      node_modules/
        jsonwebtoken/

Am I missing something?

P.S. I have compressed the directory using zip -r LambdaLayer.zip LambdaLayer/ and also uploaded it to Lambda layer manually via the AWS Console.