express_router_rest_api_versioning_v1_v2_typescript.ts

1import express, { Request, Response, Router, Application } from 'express';
2
3const app: Application = express();
4const port: number = 3000;
5
6/**
7 * API Version 1 Router
8 */
9const v1Router: Router = Router();
10
11v1Router.get('/hello', (req: Request, res: Response) => {
12    res.json({
13        message: "This is version 1 of the API"
14    });
15});
16
17/**
18 * API Version 2 Router
19 */
20const v2Router: Router = Router();
21
22v2Router.get('/hello', (req: Request, res: Response) => {
23    res.json({
24        message: "This is version 2 of the API",
25        updates: "New features added in v2"
26    });
27});
28
29// Mount routers to specific versioned paths
30app.use('/api/v1', v1Router);
31app.use('/api/v2', v2Router);
32
33app.listen(port, () => {
34    console.log(`Server running at http://localhost:${port}`);
35    console.log(`V1: http://localhost:${port}/api/v1/hello`);
36    console.log(`V2: http://localhost:${port}/api/v2/hello`);
37});