Hello world NodeJS Server

server.js

const http = require('http');
const HOST = '127.0.0.1';
const PORT = +process.argv[2] || 3001;

const server = http.createServer((req, res) => {
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end(JSON.stringify({ success: true, message: "Hello world!" }));
})

server.listen(PORT, HOST).on('error', (err) => {
    console.error(`Something went wrong:  ${err}`);
}).on('listening', () => {
    console.log(`"Hello World" Node Server running at http://${HOST}:${PORT}`);
})