router-level middleware works in the same way as application-level middleware, except it is bound to an instance of  express.Router().

code:

var express = require('express');
var app = express();
var router = express.Router(); // a middleware function with no mount path. This code is executed for every request to the router
router.use(function (req, res, next) {
console.log('Time:', Date.now());
next()
}); // a middleware sub-stack shows request info for any type of HTTP request to the /user/:id path
router.use('/user/:id', function (req, res, next) {
console.log('Request URL:', req.originalUrl);
next()
}, function (req, res, next) {
console.log('Request Type:', req.method);
next()
}); // a middleware sub-stack that handles GET requests to the /user/:id path
router.get('/user/:id', function (req, res, next) {
// if the user ID is 0, skip to the next router
if (req.params.id === '') next('route');
// otherwise pass control to the next middleware function in this stack
else next()
}, function (req, res, next) {
// render a regular page
res.send('regular');
}); // handler for the /user/:id path, which renders a special page
router.get('/user/:id', function (req, res, next) {
console.log(req.params.id);
res.send('special');
}); app.set('view engine','jade');
// mount the router on the app
app.use('/', router); app.listen();

result:

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