Throw the error: Cannot find module 'express' in NodeJs

Dung Do Tien Sep 27 2021 516

Hi, this is the first time I try to create an app with NodeJs. Like this:

 var express = require("express");
//app
var app = express();
app.use(function(req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    return next();
});

It feels simple but when run the code above and I got an error : Error: Cannot find module 'express'.

 Error: Cannot find module 'express'
Require stack:
- /home/runner/4renqlovfw5/index.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:815:15)
    at Function.Module._load (internal/modules/cjs/loader.js:667:27)
    at Module.require (internal/modules/cjs/loader.js:887:19)
    at /home/runner/4renqlovfw5/index.js:1:15
    at Script.runInContext (vm.js:130:18)
    at Object.<anonymous> (/run_dir/interp.js:209:20)
    at Module._compile (internal/modules/cjs/loader.js:999:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.Module._load (internal/modules/cjs/loader.js:708:14)

I using Nodejs v14.17.5

Thanks for any suggestions.

Have 3 answer(s) found.
  • j

    jrobertojrmx Jose Roberto Sep 27 2021

    You need to check you install express or not. You can run the command below to help install or reinstall express for you.

     npm install express --save

    Or you can run npm install command to help update/install all package

  • M

    Mario Guzmán Sep 27 2021

    You need to install Express locally into the context of your application (node_modules folder):

     npm install express

    And re-try run your app.

  • I

    Irving Sep 27 2021

    The first time gets code from git to the local computer you need to run npm install to help update all dependencies packages.

Related Q&A May You Like

  1. Error: listen EADDRINUSE: address already in use :::5000 in Node
  2. Nodejs ReferenceError: require is not defined in ES module scope
  3. Nodejs: Only file and data URLs are supported by the default ESM loader
  4. Error Require() of ES modules is not supported in Nodejs
  5. Error: Cannot find module 'node-fetch' in Express NodeJs
  6. SyntaxError: await is only valid in async function in Nodejs
  7. Error: Cannot find module 'dotenv' in NodeJs express
  8. Error: ReferenceError: window is not defined in NodeJs
  9. NodeJs: The "chunk" argument must be of type string or an instance of Buffer
  10. Error: Incorrect arguments to mysqld_stmt_execute in Nodejs
  11. NodeJs MongooseError: Operation 'x.find()` buffering timed out after 10000ms
  12. NodeJs no 'Access-Control-Allow-Origin' header is present on the requested resource
  13. Exception throw referencerrror: fs is not defined in NodeJs
  14. Nodejs express throw npm err! missing script: start
  15. Error: EACCES: permission denied, access '/usr/local/lib/node_modules' in Node
Leave An Answer
* NOTE: You need Login before leave an answer

* Type maximum 2000 characters.

* All comments have to wait approved before display.

* Please polite comment and respect questions and answers of others.

Most Quizs Popular

Start Test

Javascript - Functions

Start Test

Asp.Net Core - Exam test 01

Start Test

Asp.Net Core - Exam test 02

Start Test

C# - Level Beginner

Popular Tips

This site uses cookies so that we can remember you and understand how you interact with our website. This allows us to improve and customize your browsing experience. See our Cookies Policy.
X Close