在 node express 中找不到模块

Question

cannot find module in node express

Actual code

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  res.send('Hello World!')
})

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`)
})

error code in cmd

C:\Users\user\Desktop\project>npm express -v

7.5.3

C:\Users\user\Desktop\project>npm utils -v

7.5.3

C:\Users\user\Desktop\project>node server

node:internal/modules/cjs/loader:928
  throw err;
  ^

Error: Cannot find module './utils'
Require stack:
- C:\Users\user\Desktop\project\node_modules\qs\lib\stringify.js
- C:\Users\user\Desktop\project\node_modules\qs\lib\index.js
- C:\Users\user\Desktop\project\node_modules\express\lib\middleware\query.js
- C:\Users\user\Desktop\project\node_modules\express\lib\application.js
- C:\Users\user\Desktop\project\node_modules\express\lib\express.js
- C:\Users\user\Desktop\project\node_modules\express\index.js
- C:\Users\user\Desktop\project\server.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:925:15)
    at Function.Module._load (node:internal/modules/cjs/loader:769:27)
    at Module.require (node:internal/modules/cjs/loader:997:19)
    at require (node:internal/modules/cjs/helpers:92:18)
    at Object.<anonymous> (C:\Users\user\Desktop\project\node_modules\qs\lib\stringify.js:3:13)
    at Module._compile (node:internal/modules/cjs/loader:1108:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
    at Module.load (node:internal/modules/cjs/loader:973:32)
    at Function.Module._load (node:internal/modules/cjs/loader:813:14)
    at Module.require (node:internal/modules/cjs/loader:997:19) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    'C:\\Users\\user\\Desktop\\project\\node_modules\\qs\\lib\\stringify.js',
    'C:\\Users\\user\\Desktop\\project\\node_modules\\qs\\lib\\index.js',
    'C:\\Users\\user\\Desktop\\project\\node_modules\\express\\lib\\middleware\\query.js',
    'C:\\Users\\user\\Desktop\\project\\node_modules\\express\\lib\\application.js',
    'C:\\Users\\user\\Desktop\\project\\node_modules\\express\\lib\\express.js',
    'C:\\Users\\user\\Desktop\\project\\node_modules\\express\\index.js',
    'C:\\Users\\user\\Desktop\\project\\server.js'
  ]
}

Answer 1

first try to remove the globally installed express

then initialize a package.json file with npm init . Here you will have a list of your dependencies, scripts and name of your package and some other data.

Then install express with npm i express .

after installing try to run it with node server.js or npm start if you have written the script to run the start command in package.json

Answer 2

I got the answer

Download utils https://www.npmjs.com/package/utils

this is the error

C:\Users\user\Desktop\project> node server

node:internal/modules/cjs/loader:928
  throw err;
  ^

Error: Cannot find module 'utils'
Require stack:
- C:\Users\user\Desktop\project\server.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:925:15)
    at Function.Module._load (node:internal/modules/cjs/loader:769:27)
    at Module.require (node:internal/modules/cjs/loader:997:19)
    at require (node:internal/modules/cjs/helpers:92:18)
    at Object.<anonymous> (C:\Users\user\Desktop\project\server.js:3:15)
    at Module._compile (node:internal/modules/cjs/loader:1108:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
    at Module.load (node:internal/modules/cjs/loader:973:32)
    at Function.Module._load (node:internal/modules/cjs/loader:813:14)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ 'C:\\Users\\user\\Desktop\\project\\server.js' ]
}

C:\Users\user\Desktop\project> npm i utils

added 43 packages, removed 2 packages, changed 3 packages, and audited 110 packages in 16s

found 0 vulnerabilities

C:\Users\user\Desktop\project>node server
Example app listening at http://localhost:3000
^C

C:\Users\user\Desktop\project>