এপ্লিকেশন স্টার্ট করি

const express = require("express");
const app = express();
const port = 3000;
app.get("/",(req,res)=>{

    res.send("Hello World");

});

app.listen(port,()=>{
    console.log('start application');
});

{
  "name": "myapp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start":"node index.js" // এখানে বলে দেই 
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.18.2"
  }
}

node index.js