hello-world.js

(function(){

    const http = require('http');

    const server = http.createServer((req, res) => {
        res.statusCode = 200;
        res.setHeader('Content-Type', 'text/plain');
        res.end('Hello, World!\n');
    });

    server.listen(3000, () => {
        console.log('Server running at http://localhost:3000/');
    });

}());