cannot find module in node express - javascript

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'
]
}

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

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>

Related

Why nodejs didnt require p-queue?

I want to use p-queue npm nodejs. But it get me error. Help me why it was and how to fix it? Here my code:
const shell = require("shelljs");
const async = require("async");
const fs = require("fs");
const path = require("path");
const { default: PQueue } = require("p-queue");
const queue = new PQueue({ concurrency: 1 });
And this error:
internal/modules/cjs/loader.js:1080
throw new ERR_REQUIRE_ESM(filename, parentPath, packageJsonPath);
^
Error [ERR_REQUIRE_ESM]: Must use import to load ES Module:
C:\Users\Feruz\Desktop\codeMaster\judge\node_modules\p-queue\dist\index.js
require() of ES modules is not supported. require() of
C:\Users\Feruz\Desktop\codeMaster\judge\node_modules\p-queue\dist\index.js
from C:\Users\Feruz\Desktop\codeMaster\judge\judge.js is an ES module
file as it is a .js file whose nearest parent package.json contains
"type": "module" which defines all .js files in that package scope as
ES modules. Instead rename index.js to end in .cjs, change the
requiring code to use import(), or remove "type": "module" from
C:\Users\Feruz\Desktop\codeMaster\judge\node_modules\p-queue\package.json.
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1080:13)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Module.require (internal/modules/cjs/loader.js:952:19)
at require (internal/modules/cjs/helpers.js:88:18)
at Object.<anonymous> (C:\Users\Feruz\Desktop\codeMaster\judge\judge.js:5:29)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14) { code: 'ERR_REQUIRE_ESM' } [nodemon] app crashed - waiting for file
changes before starting...

NODE [ERR_MODULE_NOT_FOUND]: Cannot find module './config/app'

FIXED, the names of the folders in my pc changed when uploaded to github
So, my app looks something like this
├── config
| ├── app.js
|
└── index.js
app.js
Here i have all my env variables, so I have a central point from which to extract them
require('dotenv').config()
module.exports = {
appPort: process.env.PORT,
appUrl: process.env.APP_URL,
appKey: process.env.APP_KEY,
frontendUrl: process.env.FRONTEND_URL
}
index.js
central file of the server
const express = require('express')
const cors = require('cors')
const app = express()
const { appPort, frontendUrl } = require('./config/app')
app.listen(appPort , () => {
console.log(`Server listening on port ${appPort}`);
})
The problem here is that when i deploy it and starts the server, it throws me error
node:internal/modules/cjs/loader:936
throw err;
^
Error: Cannot find module './config/app'
Require stack:
- /app/index.js
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object.<anonymous> (/app/index.js:8:34)
at Module._compile (node:internal/modules/cjs/loader:1103:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) {
code: 'MODULE_NOT_FOUND',
requireStack: [ '/app/index.js' ]
}
and i really don't know why, because it works perfectly fine in my pc
the code for the whole project is actually much bigger, but only this files are the ones throwing me errors
Hope someone can help see what is happening that throws that error

Can't run require('opencv4nodejs')

I'm using macOS Monterey 12.2.1, Apple M1. And in the project directory, I installed opencv-build and opencv4nodejs by this script code:
"scripts": { "postinstall": "npm i opencv-build && npm i opencv4nodejs" }
When I run cv = require('opencv4nodejs'), I got this error message and I can't understand it. How can I run this code correctly?
/usr/local/bin/node /Users/david/Desktop/project2/main.js
/Users/david/Desktop/project2/node_modules/opencv4nodejs/lib/cv.js:47
throw err
^
Error: Cannot find module '/Users/david/Desktop/project2/node_modules/opencv4nodejs/build/Release/opencv4nodejs'
Require stack:
- /Users/david/Desktop/project2/node_modules/opencv4nodejs/lib/cv.js
- /Users/david/Desktop/project2/node_modules/opencv4nodejs/lib/opencv4nodejs.js
- /Users/david/Desktop/project2/main.js
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object.<anonymous> (/Users/david/Desktop/project2/node_modules/opencv4nodejs/lib/cv.js:40:8)
at Module._compile (node:internal/modules/cjs/loader:1103:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Module.require (node:internal/modules/cjs/loader:1005:19) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'/Users/david/Desktop/project2/node_modules/opencv4nodejs/lib/cv.js',
'/Users/david/Desktop/project2/node_modules/opencv4nodejs/lib/opencv4nodejs.js',
'/Users/david/Desktop/project2/main.js'
]
}
Process finished with exit code 1
Use Node 14.18.1, then uninstall opencv4nodejs.
Run export CXXFLAGS="-std=c++14 -Wno-c++11-narrowing"
Run npm install opencv4nodejs

npx react-native init MainApp Giving error (code: 'MODULE_NOT_FOUND',) . What's the isue here

I got this error while running the above command (npx react-native init MainApp)
I have installed the latest version of node and npm. I am not sure why this error is reflected.
Tried clearing the cache changing the node version to 17 but no luck. I am new to this react native.
node:internal/modules/cjs/loader:936
throw err;
^
Error: Cannot find module './error'
Require stack:
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#hapi\hoek\lib\assert.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#hapi\topo\lib\index.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\node_modules\joi\lib\types\keys.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\node_modules\joi\lib\types\function.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\node_modules\joi\lib\index.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\tools\config\schema.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\tools\config\readConfigFromDisk.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\tools\config\index.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\commands\install\install.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\commands\index.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\index.js
- C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#react-native-community\cli\build\bin.js
at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
at Function.Module._load (node:internal/modules/cjs/loader:778:27)
at Module.require (node:internal/modules/cjs/loader:1005:19)
at require (node:internal/modules/cjs/helpers:102:18)
at Object.<anonymous> (C:\Users\priye\AppData\Local\npm-cache\_npx\7930a8670f922cdb\node_modules\#hapi\hoek\lib\assert.js:3:21)
at Module._compile (node:internal/modules/cjs/loader:1101:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Module.require (node:internal/modules/cjs/loader:1005:19) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#hapi\\hoek\\lib\\assert.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#hapi\\topo\\lib\\index.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\node_modules\\joi\\lib\\types\\keys.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\node_modules\\joi\\lib\\types\\function.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\node_modules\\joi\\lib\\index.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\tools\\config\\schema.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\tools\\config\\readConfigFromDisk.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\tools\\config\\index.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\commands\\install\\install.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\commands\\index.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\index.js',
'C:\\Users\\priye\\AppData\\Local\\npm-cache\\_npx\\7930a8670f922cdb\\node_modules\\#react-native-community\\cli\\build\\bin.js'
]
}
Hi I myself resolved the issue. I deleted the npm-cache folder from the AppData folder and it worked :). Thanks

internal/modules/cjs/loader.js:883 throw err;

Here is the code:
const fs= require("fs");
const text=fs.readFileSync("dele.txt","utf-8");
console.log(text);
Here is the error in terminal:
Error: Cannot find module 'D:\programs\web development\tut64.js'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
at Function.Module._load (internal/modules/cjs/loader.js:725:27)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
at internal/main/run_main_module.js:17:47 {
code: 'MODULE_NOT_FOUND',
requireStack: []
}
In your script you are asking for fs module.
Try to run npm install fs in your console and be sure that you are running the command in your root folder.

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