Node.js Express Tutorial | What Is Node.js Express | Node.js Tutorial For Beginners | Simplilearn

2. What’s in it for you? What is Express?

3. What’s in it for you? What is Express? Express JS Features

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5. What’s in it for you? What is Express? Express JS Features DEMO

6. Node.js Express Framework

7. Express • Express is a flexible Node.js web application framework which provides a wide set of features to develop both web and mobile applications

8. Express • Express is a flexible Node.js web application framework which provides a wide set of features to develop both web and mobile applications • Express JS makes it much easier and simpler to build a web server with the use of middleware that can handle requests and responses

9. Express JS Features

10. Let’s see some of the core features of Express framework: • It can be used to design single-page, multi-page and hybrid web applications

11. Let's see some of the core features of Express framework: • It can be used to design single-page, multi-page and hybrid web applications • It allows to setup middlewares to respond to HTTP requests

12. Let's see some of the core features of Express framework: • It can be used to design single-page, multi-page and hybrid web applications • It allows to setup middlewares to respond to HTTP requests • It defines a routing table which is used to perform different actions based on HTTP method and URL

13. Let's see some of the core features of Express framework: • It can be used to design single-page, multi-page and hybrid web applications • It allows to setup middlewares to respond to HTTP requests • It defines a routing table which is used to perform different actions based on HTTP method and URL • It allows to dynamically render HTML Pages based on passing arguments to templates

14. A basic Hello World example varexpress = require('express'); varapp = express(); app.get('/', function (req, res) { res.send('Hello World'); }) varserver = app.listen(8081, function () { varhost = server.address().address varport = server.address().port console.log("Example app listening at http://%s:%s", host, port) }) • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request Hello_world.js

15. A basic Hello World example Importing Express framework into our Node.js application varexpress = require('express'); varapp = express(); app.get('/', function (req, res) { res.send('Hello World'); }) varserver = app.listen(8081, function () { varhost = server.address().address varport = server.address().port console.log("Example app listening at http://%s:%s", host, port) }) • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request Hello_world.js

16. A basic Hello World example Callback function with parameters ‘request’ and ‘response’ varexpress = require('express'); varapp = express(); app.get('/', function (req, res) { res.send('Hello World'); }) varserver = app.listen(8081, function () { varhost = server.address().address varport = server.address().port console.log("Example app listening at http://%s:%s", host, port) }) • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request Hello_world.js

17. A basic Hello World example varexpress = require('express'); varapp = express(); app.get('/', function (req, res) { res.send(‘Hello World'); }) varserver = app.listen(8081, function () { varhost = server.address().address varport = server.address().port console.log("Example app listening at http://%s:%s", host, port) }) • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request Hello_world.js

18. A basic Hello World example varexpress = require('express'); varapp = express(); app.get('/', function (req, res) { res.send('Hello World'); }) varserver = app.listen(8081, function () { varhost = server.address().address varport = server.address().port console.log("Example app listening at http://%s:%s", host, port) }) • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request Application will listen on the defied port which in this case is “8081”, and variables ‘host’ and ‘port’ will contain the address and the port respectively Hello_world.js

19. A basic Hello World example varexpress = require('express'); varapp = express(); app.get('/', function (req, res) { res.send('Hello World'); }) varserver = app.listen(8081, function () { varhost = server.address().address varport = server.address().port console.log("Example app listening at http://%s:%s", host, port) }) • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request This snippet is to show the address and port in the command prompt or terminal Hello_world.js

20. A basic Hello World example Command prompt shows the address and port • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request

21. A basic Hello World example Hello World • The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on • The response object represents the HTTP response that an Express app sends when it gets an HTTP request Hello World is printed on the Web Server

22. DEMO

23. DEMO DEMO