Node.js v17.5.0 [nodemon] app crashed - waiting for file changes before starting

Question

Creating node.js connection with mongodb.

MongoDb connection in error

Not getting app is running 8000 and shows "nodemon app crashed waiting for file changes before starting "

const mongoose = require('mongoose');

const express = require("express");

const app=express();

mongoose.connect('mongodb://localhost:27017/test', {useNewUrlParser:true});

const port=8000;

app.listen(port,()=>{
    console.log(`App is running at ${port}`);
}); 

Error Caused:

TypeError: Cannot assign to read only property 'map' of object '#' at Object. (/Users/praneypareek/Desktop/MERN Working Project/projbackend/node_modules/mongoose/lib/cursor/QueryCursor.js:150:27) at Module._compile (node:internal/modules/cjs/loader:1097:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1151:10) at Module.load (node:internal/modules/cjs/loader:975:32) at Function.Module._load (node:internal/modules/cjs/loader:822:12) at Module.require (node:internal/modules/cjs/loader:999:19) at require (node:internal/modules/cjs/helpers:102:18) at Object. (/Users/praneypareek/Desktop/MERN Working Project/projbackend/node_modules/mongoose/lib/query.js:12:21) at Module._compile (node:internal/modules/cjs/loader:1097:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1151:10) at Module.load (node:internal/modules/cjs/loader:975:32) at Function.Module._load (node:internal/modules/cjs/loader:822:12) a t Module.require (node:internal/modules/cjs/loader:999:19) at require (node:internal/modules/cjs/helpers:102:18) at Object. (/Users/praneypareek/Desktop/MERN Working Project/projbackend/node_modules/mongoose/lib/index.js:27:15) at Module._compile (node:internal/modules/cjs/loader:1097:14)

Node.js v17.5.0 [nodemon] app crashed - waiting for file changes before starting...

Answer 1

The latest release of Node.JS is what is causing this issue. In your package.json, make sure to set your engine to"engines": { "node": ">=0.12 < 17.5.0" } and you should be fine.

Solution which worked well for me:)

Step 01: Open your terminal and copy paste below command.

curl -o-https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | zsh

Wait patiently until its done.

Step 02: sudo vim./zshrc

Step 03: Press I for Insert Mode and copy paste below command. Must be same in three lines.

export NVM_DIR="$HOME/.nvm"

[ -s "$NVM_DIR/nvm.sh" ] &&. "$NVM_DIR/nvm.sh"

[ -s "$NVM_DIR/bash_completion" ] &&. "$NVM_DIR/bash_completion"

then press ESC key:wq (write and quite).

Step 04: brew install nvm

step 05: nvm install node (which will download latest version node)

step 06: nvm ls-remote (which make all the version available)

step 07: nvm install 14 (An Example)

step 08: nvm use 14 (this make it as default version)

source: https://github.com/nvm-sh/nvm