Node.js Hello World Server Example (http vs express.js vs fastify.js)

express.js

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

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

// Listen
const port = process.env.PORT || 5000;
app.listen(port, () => {
  console.log(`Listening on localhost:${port}`);
});

fastify.js

const fastify = require('fastify');
const app = fastify({ logger: true });

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

// Listen
const port = process.env.PORT || 3000;
app.listen(port, (err, address) => {
  console.log(`Server listening on: ${address}`);
});

http.js

const http = require('http');

const port = process.env.PORT || 3000;

http
  .createServer((req, res) => {
    res.write('Hello World!');
    res.end();
  })
  .listen(5000);

console.log(`Server listening on port ${port}`);