HTTP Server

1import { createServer, IncomingMessage, ServerResponse } from "http";
2 
3// Route handler type
4type RouteHandler = (
5  req: IncomingMessage,
6  res: ServerResponse
7) => void | Promise<void>;
8 
9// Simple router
10class Router {
11  private routes: Map<string, Map<string, RouteHandler>> = new Map();
12 
13  get(path: string, handler: RouteHandler): void {
14    this.addRoute("GET", path, handler);
15  }
16 
17  post(path: string, handler: RouteHandler): void {
18    this.addRoute("POST", path, handler);
19  }
20 
21  private addRoute(method: string, path: string, handler: RouteHandler): void {
22    if (!this.routes.has(method)) {
23      this.routes.set(method, new Map());
24    }
25    this.routes.get(method)!.set(path, handler);
26  }
27 
28  handle(req: IncomingMessage, res: ServerResponse): void {
29    const method = req.method || "GET";
30    const path = req.url || "/";
31 
32    const handler = this.routes.get(method)?.get(path);
33 
34    if (handler) {
35      handler(req, res);
36    } else {
37      res.statusCode = 404;
38      res.end(JSON.stringify({ error: "Not found" }));
39    }
40  }
41}
42 
43// JSON response helper
44function json(res: ServerResponse, data: unknown, status = 200): void {
45  res.statusCode = status;
46  res.setHeader("Content-Type", "application/json");
47  res.end(JSON.stringify(data));
48}
49 
50// Create router and add routes
51const router = new Router();
52 
53router.get("/", (req, res) => {
54  json(res, { message: "Welcome to the API" });
55});
56 
57router.get("/health", (req, res) => {
58  json(res, { status: "healthy", timestamp: new Date().toISOString() });
59});
60 
61router.get("/users", (req, res) => {
62  const users = [
63    { id: 1, name: "Alice" },
64    { id: 2, name: "Bob" },
65  ];
66  json(res, users);
67});
68 
69// Create and start server
70const server = createServer((req, res) => {
71  router.handle(req, res);
72});
73 
74const PORT = process.env.PORT || 3000;
75 
76server.listen(PORT, () => {
77  console.log(`Server running at http://localhost:${PORT}`);
78});