How do I resolve “Cannot find module” error using Node.js?

The Question :

657 people think this question is useful

After pulling down a module from GitHub and following the instructions to build it, I try pulling it into an existing project using:

> npm install ../faye

This appears to do the trick:

> npm list
/home/dave/src/server
└─┬ faye@0.7.1
  ├── cookiejar@1.3.0
  ├── hiredis@0.1.13
  └── redis@0.7.1

But Node.js can’t find the module:

> node app.js
node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
              ^
Error: Cannot find module 'faye'
    at Function._resolveFilename (module.js:334:11)
    at Function._load (module.js:279:25)
    at Module.require (module.js:357:17)
    at require (module.js:368:17)
    at Object.<anonymous> (/home/dave/src/server/app.js:2:12)
    at Module._compile (module.js:432:26)
    at Object..js (module.js:450:10)
    at Module.load (module.js:351:31)
    at Function._load (module.js:310:12)
    at Array.0 (module.js:470:10)

I really want to understand what is going on here, but I’m at a bit of a loss as to where to look next. Any suggestions?

The Question Comments :
  • The node_modules directory is expected to be in the root of your project, alongisde app.js in your case. Why did you use .. the npm install path?
  • After changing “npm install ../faye” to “npm install ../faye/build”, it works as expected. I don’t know how typical this is, but faye creates a build directory when it is built and puts a copy of package.json in there. npm doesn’t complain about package.json at the root level, but it references files that don’t exist at that level.
  • I solved the problem, but didn’t really get any resolution to my real question, which was how to troubleshoot this issue. I’ll try to come up with some suggestions for improving npm and/or node to make it easier for newcomers to avoid this situation.
  • Go through this Link, you may get some idea like where exactly its failing to lookup your modules..
  • Check weather you are in the same folder where you installed it ? if you did not installed it globally .

The Answer 1

548 people think this answer is useful

Using npm install installs the module into the current directory only (in a subdirectory called node_modules). Is app.js located under home/dave/src/server/? If not and you want to use the module from any directory, you need to install it globally using npm install -g.

I usually install most packages locally so that they get checked in along with my project code.

Update (8/2019):

Nowadays you can use package-lock.json file, which is automatically generated when npm modifies your node_modules directory. Therefore you can leave out checking in packages, because the package-lock.json tracks the exact versions of your node_modules, you’re currently using. To install packages from package-lock.json instead of package.json use the command npm ci.

Update (3/2016):

I’ve received a lot of flak for my response, specifically that I check in the packages that my code depends on. A few days ago, somebody unpublished all of their packages (https://kodfabrik.com/journal/i-ve-just-liberated-my-modules) which broke React, Babel, and just about everything else. Hopefully it’s clear now that if you have production code, you can’t rely on NPM actually maintaining your dependencies for you.

The Answer 2

481 people think this answer is useful

I had a very similar issue. Removing the entire node_modules folder and re-installing worked for me:

rm -rf node_modules
npm install

The Answer 3

91 people think this answer is useful
npm install --save module_name

For example, if the error is:

{ [Error: Cannot find module ‘/root/.npm/form-data’] code: ‘MODULE_NOT_FOUND’ }

then you can resolve this issue by executing the command npm install --save form-data.

The Answer 4

26 people think this answer is useful

For TypeScript users, if you are importing a built-in Node module (such as http, path or url) and you are getting an error such as "Cannot find module "x" then the error can be fixed by running

npm install @types/node --save-dev

The command will import the NodeJS TypeScript definitions into your project, allowing you to use Node’s built-in modules.

The Answer 5

19 people think this answer is useful

This happens when a first npm install has crashed for some reason (SIGINT of npm), or that the delay was too long, or data is corrupted. Trying an npm install again won’t save the problem.

Something got wrong on the npm first check, so the best choice is to remove the file and to restart npm install.

The Answer 6

11 people think this answer is useful

If you use nvm, check that existing node_modules that are bindings to other libraries are compiled for the correct Node.js version.

I was having the same error. The reason was the following: We use nvm since we’re running two apps on a server, one requires Node.js 5.6 because it uses node-gd (which doesn’t run on Node.js 6 for now), the other requires Node.js 6. Node.js 6 is the apt-get installation.

Also we use the pm2 tool to deploy.

So, the default setup is that the pm2 process starts when nvm is not in effect, so it uses the apt-get installation of Node.js (version 6). So the main pm2 daemon starts with Node.js 6. If I run applications in fork mode they start in separate processes and nvm settings are in effect. When I run applications in cluster mode – they inherit the non-nvm environment.

So when I tried to switch to the cluster mode the application failed to start because the bindings compiled for 5.6 fail with this message.

I’ve fixed that by restarting pm2 when nvm setings are in effect. Also startup scripts should be fixed.

The Answer 7

9 people think this answer is useful

I experienced this error yesterday. Took me a while to realise that the main entry in package.json was pointing to a file that I’d moved. Once I updated that the error disappeared and the package worked.

The Answer 8

9 people think this answer is useful

Check if the enviroment variable NODE_PATH is set correctly and pointing to the node_modules path. nodejs uses this variable to search for the libraries

The Answer 9

7 people think this answer is useful

This error can be encountered if you are requireing a module that has a missing or incorrect main field in its package.json. Though the module itself is installed, npm/node has to use a single .js file as an entrypoint to your module. If the main field is not there, it defaults to looking for index.js in your module’s folder. If your module’s main file is not called index.js, it won’t be able to require it.

Discovered while turning a browserify-based module into a CommonJS require-able module; browserify didn’t care about the missing main field, and so the error had gone unnoticed.

The Answer 10

5 people think this answer is useful

Remove your node_module root folder from your project(eg: myApp). Go to myApp folder and then type below command from terminal

>myApp>npm install

It will install all the dependency modules required for your project.

The Answer 11

4 people think this answer is useful

Specify the path to the restler folder, which will be inside node_modules folder like : var rest = require(‘./node_modules/restler’);

This worked for me.

The Answer 12

3 people think this answer is useful

I can add one more place to check; the package that I was trying to use was another one of my own packages that I had published to a private NPM repo. I had forgotten to configure the ‘main’ property in the package.json properly. So, the package was there in the node_modules folder of the consuming package, but I was getting “cannot find module”. Took me a few minutes to realise my blunder. 🙁

The Answer 13

3 people think this answer is useful

I faced the same problem when someone else in the team updated package.json in SVN. Merely removing the node_modules directory did not help. How I solved the problem is:

rm -rf node_modules
rm package.json
rm package-lock.json
svn up
npm install
ng build --env=prod

Hope this helps someone!

The Answer 14

3 people think this answer is useful

If you are using typescript and getting an error after installing all node modules then remove package-lock.json. And then run npm install.

The Answer 15

2 people think this answer is useful

PRO TIP:

This error happened to me, while fighting fatigue and mild illness, because I typed node blah instead of npm blah.

The error message received wasn’t angry enough to alert me to my own folly!

The Answer 16

2 people think this answer is useful

If all other methods are not working for you… Try

npm link package_name

e.g

npm link webpack
npm link autoprefixer

e.t.c

The Answer 17

1 people think this answer is useful

I was trying to publish my own package and then include it in another project. I had that issue because of how I’ve built the first module. Im using ES2015 export to create the module, e.g lets say the module looks like that:

export default function(who = 'world'){
    return `Hello ${who}`;
}

After compiled with Babel and before been published:

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

exports.default = function () {
    var who = arguments.length <= 0 || arguments[0] === undefined ? 'world' : arguments[0];


    return 'Hello ' + who;
};

So after npm install module-name in another project (none ES2015) i had to do

var hello = require('module-name').default;

To actually got the package imported.

Hope that helps!

The Answer 18

1 people think this answer is useful

Just found an unusual scenario that may be of use to someone and is sort of a red herring.

I was also getting the Cannot Find Module error but oddly everything worked perfectly in my local (Mac hosted) Node.js environment. This problem only appeared when the code was deployed on our Linux server.

Well… it turned out to be a typo that (apparently) the Mac based Node.js installation was perfectly happy to ignore.

The include looked like this:

var S3Uploader = require('./S3Uploader.class');

But the actual file was called “s3Uploader.class.js”

Notice the casing difference in the ‘s’ vs. ‘S’ between the code and the filename.

So – in the odd chance that none of the other solutions here are solving your problem, triple check that you’re not mis-casing the characters in your included filename! 🙂

and DUH!

The Answer 19

1 people think this answer is useful

In my case I had UNMET PEER DEPENDENCY redux@^3.0.0 causing this error message, see all of them and install missing modules again using –save

npm install redux --save

The Answer 20

1 people think this answer is useful

Removing node/npm and then re-installing the stable(not the latest) version worked for me.

sudo rm -rf /usr/local/{lib/node{,/.npm,_modules},bin,share/man}/{npm*,node*,man1/node*}

https://nodejs.org/en/download/

The Answer 21

0 people think this answer is useful

Encountered this problem while using webpack with webpack-dev-middleware.

Had turned a single file into a folder.

The watcher seemed to not see the new folder and the module was now missing.

Fixed by restarting the process.

The Answer 22

0 people think this answer is useful

Maybe like me you set ‘view engine’ in express to an engine that doesn’t exist, or tried to use an unregistered templating engine. Make sure that you use: app.engine('engine name',engine) app.set('view engine','engine name')

The Answer 23

0 people think this answer is useful

Please install the new CLI v3 (npm install -g ionic@latest).

If this issue is still a problem in CLI v3. Thank you!

The Answer 24

0 people think this answer is useful

I had this issue using live-server (using the Fullstack React book):

I kept getting:

Error: Cannot find module './disable-browser-cache.js' 
...

I had to tweak my package.json

  • From:

    “scripts”: { … “server”: “live-server public –host=localhost –port=3000 –middleware=./disable-browser-cache.js” … } “scripts”: {

  • To:

    … “server”: “live-server public –host=localhost –port=3000 –middleware=../../disable-browser-cache.js” … }

Notice relative paths seem broken/awkward… ./ becomes ../../

I found the issue here

Also if anyone follows along with that book:

  1. change devDependencies in packages.json to:

"live-server": "https://github.com/tapio/live-server/tarball/master"


Currently that upgrades from v1.2.0 to v1.2.1

  1. It’s good to use nvm.
  2. It’s best to install v13.14 of Node (*v14+ creates other headaches) nvm install v13.14.0
  3. nvm alias default v13.14.0
  4. Update npm with npm i -g npm@7.3.0
  5. run: npm update
  6. you can use npm list to see the hierarchy of dependencies too. (For some reason node 15 + latest npm defaults to only showing first level of depth – a la package.json. That renders default command pointless! You can append --depth=n) to make command more useful again).
  7. you can use npm audit too. There issues requiring (update of chokidar and some others packages) to newer versions. live-server hasn’t been updated to support the newer corresponding node v 14 library versions.

See similar post here


Footnote: Another thing when you get to the JSX section, check out my answer here: https://stackoverflow.com/a/65430910/495157

When you get to:

  • Advanced Component Configuration with props, state, and children. P182+, node version 13 isn’t supported for some of the dependencies there.
  • Will add findings for that later too.

The Answer 25

-3 people think this answer is useful

First of all, yes, a part of my answer definitely is helpful to solve the error that is posted by OP. Secondly, after trying the below step, I faced a couple of other errors, and so, have written the solution of those too.

(Psst! I am not sure if I’ve successfully helped in solving the above error, or if I’ve broken some rule or format of answering, but I faced the above error and some others and it took much time for me to find the proper solutions for those errors. I’m writing the complete solution because in case, if someone else also faces these errors, then he’ll hopefully get a solution here.)

So adding to, and elaborating the answer provided by PrashanthiDevi, and also adding my personal experience, here it is:

I am new to the whole e2e and unit tests part. I started looking into this part from Protractor. Now I already had the files in which tests were written, but I had to run the tests.

I had already installed all the required softwares and tools, but when I initially ran the code for running the tests, gulp itest, I got this ‘Cannot find module’ Error. After going through many different questions on SO, I found one answer that I thought could help getting a solution.

The person had suggested to run the command npm install in my project folder.

The reason for doing this was to update the node-modules folder, inside our project folder, with all the required and necessary files and dependencies.

(The below part maybe irrelevant with this question, but might be helpful if anyone came across the same situation that I faced.)

The above step surely solved my previous error, but threw a new one! This time the error being Could not find chromedriver at '..\node_modules\protractor\selenium\chromedriver'.

However, the solution of this error was pretty silly (and funny) to me. I already had the chromedriver file in my selenium folder. But, turns out that the above error was coming because my chromedriver files were inside selenium folder and not inside chromedriver folder. So, creating a chromedriver folder and copying the chromedriver files there solved my problem!

Also, for the error: Timed out waiting for the WebDriver Server, you could add this line of code to conf.js file inside exports.config{}:

seleniumAddress: 'http://localhost:8080/'

Hope this helps!

The Answer 26

-33 people think this answer is useful

Change the directory and point to your current project folder and then “npm install”. .

This will install all dependencies and modules into your project folder.

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