nodejs - hello world

Node

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var http = require("http");

http.createServer(function (req, res) {

   // Send the HTTP header 
   // HTTP Status: 200 : OK
   // Content Type: text/plain
   res.writeHead(200, {'Content-Type': 'text/plain'});
   
   // Send the res body as "Hello World"
   res.end('Hello World\n');
}).listen(3000);

// Console will print the message
console.log('Server running at http://127.0.0.1:3000/');

Node + Express

index.js file

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let express = require("express");
let app = express();

app.get("/", function (req, res) {
    res.send("hello world");
});

app.listen(3000, function () {
    console.log("Server Started");
});

ES6

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const express = require('express');
const app = express();

app.get('/', (req, res) => res.send('Hello World!'));

app.listen(3000, () => console.log('Example app listening on port 3000!'));