Express.js Router – express.Router

Express.js Router is somewhat like nesting a small server within the server.

Create an Express.js router

In the following example, we will use the router to create an API. The API is created separately to demonstrate modularization.

router1.js

　
var express = require('express')　
var router1　= express.Router()　
　
//　Middleware specific to this router
router1.use(function timeLog(req, res, next) {　
　　console.log('Requested URI Path: ', req.url)　
　　next()　
　})　
　
//　Define the home page route
router1.get('/', function(req, res) {　
　　res.send('Birds home page')　
　})　
　
//　Define the route for about
router1.get('/about', function(req, res) {　
　　res.send('About birds')　
　})　
　
module.exports = router1

We use express.Router() to create a router and then create some routing paths.

app.js

　
var express = require('express')　
var app = express()　
　
var router1　= require('/router1')　
app.use('/api/', router1)　
　
//　Start Server
var server = app.listen(8000, function(){　
　　　　console.log('Listening on port　8000...')　
　})

　　 when we use　app.use('/api/', router1all requests to the server with URI path,/api/　now are all routed to router1//localhost:8000/api/“1in the “ /”route. This is because forrouter1,　http://localhost:8000/api/is considered as the basic path.

When you click on URI, http://localhost:8000/api/about/,/about/The selected route will be.

Terminal Log

Summary

On the first use, it may confuse you about the execution process. However, through practice, it can become a powerful tool for creating modular express applications.