What Is Node.js? | Introduction To Node.js | Node JS Tutorial For Beginners | Simplilearn

2. What’s in it for you? What is Node.js?

3. What’s in it for you? What is Node.js? Why Node.js?

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5. What’s in it for you? What is Node.js? Why Node.js? Parts of Node.js

6. What’s in it for you? What is Node.js? Why Node.js? Parts of Node.js Node.js Express Framework

7. What’s in it for you? What is Node.js? Why Node.js? Parts of Node.js Node.js Use-Cases Node.js Express Framework

8. What’s in it for you? What is Node.js? Why Node.js? Parts of Node.js Node.js Use-Cases Industry Trends Node.js Express Framework

9. What is Node.js?

10. In the Forefront User interacts only with the “Client” of the web application, the rest is handled by “Server” Server Database Client

11. Behind the Scenes Client Server Database

12. Behind the Scenes Client Server Database

13. React JS, Angular Client Server Database

14. React JS, Angular Node.js, PHP, Java Client Server Database

15. React JS, Angular Node.js, PHP, Java MySQL, MongoDB Client Server Database

16. What is Node.js? • Node.js is an open-source, cross-platform JavaScript runtime environment and library for running web applications outside the client’s browser

17. Node.js is an open-source, cross-platform JavaScript runtime environment and library for running web applications outside the client’s browser • It is used for creating server-side web applications

18. What is Node.js? • Node.js is an open-source, cross-platform JavaScript runtime environment and library for running web applications outside the client’s browser • It is used for creating server-side web applications • Node.js is perfect for data-intensive applications as it uses an asynchronous, event-driven model.

19. Node.js was developed by Ryan Dahl in 2009 and its latest version is v13.3.0

20. Why Node.js?

21. Node.js is really fast

22. Node.js is really fast • Node Package Manager has over 50,000 bundles for at the developers’ disposal

23. Node.js is really fast • Node Package Manager has over 50,000 bundles for at the developers’ disposal • Perfect for data intensive, real-time web applications as Node.js never waits for an API to return data

24. Node.js is really fast • Node Package Manager has over 50,000 bundles for at the developers’ disposal • Perfect for data intensive, real-time web applications as Node.js never waits for an API to return data • Better synchronization of code between server and client due to same code base

25. Node.js is really fast • Node Package Manager has over 50,000 bundles for at the developers’ disposal • Perfect for data intensive, real-time web applications as Node.js never waits for an API to return data • Better synchronization of code between server and client due to same code base • Easy for web developers to start using Node.js in their projects as it is a JavaScript library

26. Parts of Node.js

27. Modules Debugger Console DNS Domain Cluster Buffer Global Error Handling Streaming

28. Modules Debugger Console DNS Let us go through each part of Node.js Domain Cluster Buffer Global Error Handling Streaming

29. Modules Debugger Console DNS Domain Cluster Buffer Global Error Handling Streaming

30. Modules • Modules are like JavaScript libraries that can be used in a Node.js application to include a set of functions

31. Modules // CREATING A WEB SERVER // Include modules var http = require(‘http’);  var server = http.createServer(function(req, res){ //write your code here }); server.listen(2000); • Modules are like JavaScript libraries that can be used in a Node.js application to include a set of functions • To include a module in a Node.js application, use require() function with the parenthesis containing the name of the module

32. Modules • Node.js has many modules to provide basic functionality needed for a web application • Some of them are mentioned in this table

33. Modules Debugger Console DNS Domain Cluster Buffer Global Error Handling Streaming

34. Console • Console is a module that provides a way to debug similar to that of the JavaScript console provided by the internet browsers

35. Console • Console is a module that provides a way to debug that is like the basic JavaScript console provided by the internet browsers • It prints messages to stdout and stderr // WRITING “hello world” to console console.log(‘hello world’);

36. Modules Debugger Console DNS Domain Cluster Buffer Global Error Handling Streaming

37. Cluster • Node.js is built upon the concept of single-threaded programming

38. Cluster • Node.js is built upon the concept of single-threaded programming • Cluster is a module that allows multi-threading by creating child processes that share the same server port and run simultaneously

39. Cluster var cluster = require('cluster');if (cluster.isWorker) {  console.log(‘Child thread’);} else {  console.log(‘Parent thread');cluster.fork();cluster.fork();} A cluster can be added to an application in this way

40. Cluster Including cluster module in the application var cluster = require('cluster');if (cluster.isWorker) {  console.log(‘Child thread’);} else {  console.log(‘Parent thread');cluster.fork();cluster.fork();} A cluster can be added to an application in this way

41. Cluster var cluster = require('cluster');if (cluster.isWorker) {  console.log(‘Child thread’);} else {  console.log(‘Parent thread');cluster.fork();cluster.fork();} A cluster can be added to an application in this way Creating child threads by using fork() method

42. Modules Debugger Console DNS Domain Cluster Buffer Global Error Handling Streaming

43. Global • Global objects in Node.js are available in all modules

44. Global • Global objects in Node.js are available in all modules • These objects are functions, modules, strings, etc.

45. Global Some Node.js global objects are mentioned in the table

46. Modules Debugger Console DNS Domain Cluster Buffer Global Error Handling Streaming

47. Error handling

48. <EvalError>, <SyntaxError>, <RangeError>, <ReferenceError>, <TypeError>, and <URIError> Error handling

49. Error handling <File does not exist>, <closed socket>

50. Error handling Errors specified by user in the code