API Versioning example 54

What this example teaches

API Versioning

Output

Express server listens on port 3000 and returns a JSON response on matched routes.

Line-by-line explanation

• Line 1 sets up the API Versioning example: import express from "express";.
• Line 2 adds one required part of the working pattern: const app = express();.
• Line 3 adds one required part of the working pattern: app.use(express.json());.
• Line 4 adds one required part of the working pattern: app.post("/api/api-versioning", (req, res) => res.json({ success: true, processed: req.body }));.

Why this example is useful

This example is useful because it isolates api versioning without surrounding noise, so you can see the idea clearly.

Where it is used in real projects

API Versioning appears in real ExpressJS work when a feature needs a clear pattern that can be reviewed and changed safely.

Beginner variation

Change one label, value or condition in the API Versioning example and run it again.

Advanced variation

Combine API Versioning with validation, error handling or reusable structure.