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Express.js Routing

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Routing is made from the word route. It is used to determine the specific behavior of an application. It specifies how an application responds to a client request to a particular route, URI or path and a specific HTTP request method (GET, POST, etc.). It can handle different types of HTTP requests.
Let's take an example to see basic routing.
File: routing_example.js
  1. var express = require('express');  
  2. var app = express();  
  3. app.get('/', function (req, res) {  
  4.    console.log("Got a GET request for the homepage");  
  5.    res.send('Welcome to JavaTpoint!');  
  6. })  
  7. app.post('/', function (req, res) {  
  8.    console.log("Got a POST request for the homepage");  
  9.    res.send('I am Impossible! ');  
  10. })  
  11. app.delete('/del_student', function (req, res) {  
  12.    console.log("Got a DELETE request for /del_student");  
  13.    res.send('I am Deleted!');  
  14. })  
  15. app.get('/enrolled_student', function (req, res) {  
  16.    console.log("Got a GET request for /enrolled_student");  
  17.    res.send('I am an enrolled student.');  
  18. })  
  19. // This responds a GET request for abcd, abxcd, ab123cd, and so on  
  20. app.get('/ab*cd', function(req, res) {     
  21.    console.log("Got a GET request for /ab*cd");  
  22.    res.send('Pattern Matched.');  
  23. })  
  24. var server = app.listen(8000, function () {  
  25. var host = server.address().address  
  26.   var port = server.address().port  
  27. console.log("Example app listening at http://%s:%s", host, port)  
  28. })  
ExpressJS Routing
You see that server is listening.
Now, you can see the result generated by server on the local host http://127.0.0.1:8000
Output:
This is the homepage of the example app.
ExpressJS Routing
Note: The Command Prompt will be updated after one successful response.
ExpressJS Routing
You can see the different pages by changing routes. http://127.0.0.1:8000/enrolled_student
ExpressJS Routing
Updated command prompt:
ExpressJS Routing
This can read the pattern like abcd, abxcd, ab123cd, and so on.
Next route http://127.0.0.1:8000/abcd
ExpressJS Routing
Next route http://127.0.0.1:8000/ab12345cd
ExpressJS Routing
Updated command prompt:
ExpressJS Routing

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