What is Express?

Express is a minimal Node.js framework that wraps the verbose raw HTTP module in clean routing and middleware so you can build web servers and APIs with little boilerplate.

Key features:

• Routing (map URLs to handler functions)
• Middleware support
• Request/response utilities
• Static file serving

Basic structure:

import express from 'express';
const router = express.Router();

router.get('/hello', function(req, res) {
    res.send('Hello World!');
});

export default router;

Why use Express?

• Raw Node.js HTTP handling is verbose
• Express provides clean, declarative routing
• Large ecosystem of middleware
• De facto standard for Node.js web servers

Go deeper:

• Express: Hello World example — the minimal Express app, official docs.