How can I use middleware with Express Router?

How can I use middleware with Express Router?

You can use middleware in Express Router by defining it before your route handlers. For example, you can use app.use() to apply middleware globally or router.use() for specific routes.

Can you give me an example of middleware in action?

Sure! Here's a simple example:

const express = require('express');
const router = express.Router();

const loggerMiddleware = (req, res, next) => {
    console.log(`Request URL: ${req.url}`);
    next();
};

router.use(loggerMiddleware);

router.get('/users', (req, res) => {
    res.send('User list');
});

module.exports = router;

What if I want to apply middleware only to certain routes?

You can apply middleware to specific routes by using router.use() before defining those routes. For example:

router.use('/admin', adminMiddleware);
router.get('/admin/dashboard', (req, res) => {
    res.send('Admin Dashboard');
});