Node.js — Run JavaScript Everywhere

// server.mjs import { createServer } from 'node:http'; const server = createServer((req, res) => { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('Hello World!\n'); }); // starts a simple http server locally on port 3000 server.listen(3000, '127.0.0.1', () => { console.log('Listening on 127.0.0.1:3000'); }); // run with `node server.mjs` // tests.mjs import assert from 'node:assert