npm init

npm i express

npm i --save-dev nodemon

// package.json

{
  "name": "01_simple_graphql",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "devStart": "nodemon server.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.18.2"
  }
}

// server.js

const express = require('express')
const app = express()
const port = 5000

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

app.listen(port, () => console.log('Server Running'))