Import & Create Server

import http from "node:http";

const server = http.createServer((req, res) => {
  // handle request
});

server.listen(3000, () => {
  console.log("Server running on port 3000");
});

• http.createServer(cb) registers a request handler
• Callback receives request and response objects
• server.listen(port) starts the server

Request Object (req)

const { method, url, headers } = req;

• method: HTTP verb (GET, POST, OPTIONS, etc.)
• url: request path (e.g. /api/test)
• headers: HTTP headers (object)
• req.on("data"): stream for reading request body (e.g. JSON)
• req.on("end"): marks the end of incoming data

Response Object (res)

res.writeHead(statusCode, headers)

Sets status code and headers. Must be called before res.end(). Use writeHead() to explicitly send status and headers

res.writeHead(200, { "Content-Type": "application/json" });

res.setHeader(name, value)

Sets a single header. Can be called multiple times before res.end().

res.setHeader("Content-Type", "application/json");

res.statusCode = code