Routing & Middleware

Express routing handles HTTP requests. Middleware functions execute during the request-response cycle.

Syntax

NODEJS

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app.get('/users', getUsers);
app.post('/users', createUser);
app.use(logger);  // middleware

Express Routes and Middleware

NODE

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const express = require("express");
const app = express();

// Custom middleware
const logger = (req, res, next) => {
    console.log(`${req.method} ${req.url}`);
    next();
};

app.use(logger);
app.use(express.json());

// Route parameters
app.get("/users/:id", (req, res) => {
    res.json({ id: req.params.id });
});

// Router
const router = express.Router();
router.get("/posts", (req, res) => res.json([]));
app.use("/api", router);

Try It Yourself

Practice

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Exercise

Practice this concept.

Answer

Write the code as shown above.

Quick Quiz

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What did you learn?

Concept A

Concept B

Concept C

Concept D

This covers the basics.

Retry Quiz

Interview Questions

Explain this concept.

It is a fundamental Node.js feature.

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