nodemon app crashed : Error code- MODULE_NOT_FOUND, requirestack: [ ]

Question

When I am running nodemon run start it is giving me the following error I am running this on macos. Not sure if that matters or not. ERROR

node:internal/modules/cjs/loader:926
  throw err;
  ^

Error: Cannot find module '/Users/jarvis/Documents/Backend/mongoTelusko/run'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:923:15)
    at Function.Module._load (node:internal/modules/cjs/loader:768:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}
[nodemon] app crashed - waiting for file changes before starting...

This is my app.js file

const express = require('express')
const mongoose = require('mongoose')
const url = 'mongodb://localhost/AlienDBex'

    enter code here

const app = express()

mongoose.connect(url, {useNewUrlParser: true})
const con = mongoose.connection

con.on('open', function(){
    console.log('Connected...')
})

This is my package.json file

{
  "name": "mongotelusko",
  "version": "1.0.0",
  "main": "app.js",
  "scripts": {
    "start": "nodemon app.js"
  },
  "author": "malay",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.1",
    "mongodb": "^3.6.5",
    "mongoose": "^5.12.2"
  },
  "devDependencies": {
    "nodemon": "^2.0.7"
  },
  "description": ""
}

Answer 1

"scripts": {
    "start": "nodemon app.js"
  }, 

Since you have specified "start" script in package.json, npm start command automatically calls nodemon app.js However, you can also run the nodemon app.js manually which also has the same effect.

Wrong: nodemon run start
Correct: nodemon app.js or npm start