Node.js bisa membuat web server tanpa framework apapun.

Server paling sederhana:

import http from "http";

const server = http.createServer((req, res) => {
  res.writeHead(200, { "Content-Type": "text/plain" });
  res.end("Halo dari Node.js!");
});

server.listen(3000, () => {
  console.log("Server berjalan di http://localhost:3000");
});

Membaca URL dan method:

const server = http.createServer((req, res) => {
  const { method, url } = req;

  if (method === "GET" && url === "/") {
    res.writeHead(200, { "Content-Type": "application/json" });
    res.end(JSON.stringify({ message: "Hello!" }));
  } else if (method === "GET" && url === "/users") {
    res.writeHead(200, { "Content-Type": "application/json" });
    res.end(JSON.stringify({ users: ["Budi", "Siti"] }));
  } else {
    res.writeHead(404);
    res.end("Not Found");
  }
});

Masalah: Kode ini akan sangat panjang untuk banyak route. Solusi? Express.js!