Node JS Core Module PowerPoint Presentation

Mar 1, 2024Download as PPTX, PDF0 likes210 views

This document discusses Node.js core modules and provides examples of the http, fs, and os core modules. It explains that core modules provide basic functionality like filesystem access, HTTP interfaces, and more. The http module can create HTTP servers, the fs module allows working with the filesystem, and the os module provides operating system related methods and properties. Examples show how to require and use each module to perform common tasks like reading and writing files, creating HTTP servers, and getting OS information.

Common JS Modules
• Node.js Core Module
• Node.jsThird-Party Modules
• Node.js File Modules
• Node.js Folder Modules

Core Module
• Core module provide most of the basic functionalities of node, including
filesystem access, HTTP and HTTPS interfaces and much more.
• Node.js has a set of built-in modules which you can use without any further
installation.
• To load a core module use require method in JS File.
• var module = require('module_name');
• The require() function will return a JavaScript type depending on what the particular module returns.

$Example: • var fs = require(‘module_name’); fs.readFile(‘/sample.html’, function(err,data){ if (err){ return console.log(err); } Console.log(data); });$

• var http = require('http’);
• http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.end('Hello World!');
}).listen(8080);

List of Core modules in node
• Node.js Modules
• In Node.js, Modules are the blocks of encapsulated code that communicates with an
external application on the basis of their related functionality. Modules can be a single file
or a collection of multiples files/folders.The reason programmers are heavily reliant on
modules is because of their re-usability as well as the ability to break down a complex piece
of code into manageable chunks.
• Modules are of three types:
• Core Modules
• local Modules
• Third-party Modules.

What is http module and what does it do?
• The Built-in HTTP Module
• Node.js has a built-in module called HTTP, which allows Node.js to transfer data over
the HyperTextTransfer Protocol (HTTP).
• To include the HTTP module, use the require() method:
• var http = require('http');
• Node.js as aWeb Server
• The HTTP module can create an HTTP server that listens to server ports and gives a
response back to the client.
• Use the createServer() method to create an HTTP server:

$Basic function in http module Node.js HTTP Module var http = require('http'); Initiate demo_http.js: C:UsersYour Name>node demo_http.js. demo_http_url.js. var http = require('http'); http. createServer(function (req, res) { res. writeHead(200, {'Content-Type': 'text/html'}); res. ... Initiate demo_http_url.js: C:UsersYour Name>node demo_http_url.js.$

basic function in fs module
• Node.js as a File Server
• The Node.js file system module allows you to work with the file system on your computer.
• To include the File System module, use the require() method:
• var fs = require('fs');
• Common use for the File System module:
• Read files
• Create files
• Update files
• Delete files
• Rename files
• Read Files
• The fs.readFile() method is used to read files on your computer.

What is os module and what does it do?
The os module is a built-in Nodejs module that is used to get information about a computer’s operating system. In other words, the os module
provides operating system-related utility methods and properties.
Syntax
const os = require('os');
Now, let’s take a look at some properties and methods of the os module.
os.type()
os.type() method returns the name of the operating system of the computer.
1
const os = require("os");
2
3
console.log(os.type())

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Node JS Core Module PowerPoint Presentation

1. Node JS Core Modules

2. Common JS Modules • Node.js Core Module • Node.jsThird-Party Modules • Node.js File Modules • Node.js Folder Modules

3. Core Module • Core module provide most of the basic functionalities of node, including filesystem access, HTTP and HTTPS interfaces and much more. • Node.js has a set of built-in modules which you can use without any further installation. • To load a core module use require method in JS File. • var module = require('module_name'); • The require() function will return a JavaScript type depending on what the particular module returns.

4. Example: • var fs = require(‘module_name’); fs.readFile(‘/sample.html’, function(err,data){ if (err){ return console.log(err); } Console.log(data); });

5. • var http = require('http’); • http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/html'}); res.end('Hello World!'); }).listen(8080);

6. List of Core modules in node • Node.js Modules • In Node.js, Modules are the blocks of encapsulated code that communicates with an external application on the basis of their related functionality. Modules can be a single file or a collection of multiples files/folders.The reason programmers are heavily reliant on modules is because of their re-usability as well as the ability to break down a complex piece of code into manageable chunks. • Modules are of three types: • Core Modules • local Modules • Third-party Modules.

7. What is http module and what does it do? • The Built-in HTTP Module • Node.js has a built-in module called HTTP, which allows Node.js to transfer data over the HyperTextTransfer Protocol (HTTP). • To include the HTTP module, use the require() method: • var http = require('http'); • Node.js as aWeb Server • The HTTP module can create an HTTP server that listens to server ports and gives a response back to the client. • Use the createServer() method to create an HTTP server:

8. Basic function in http module Node.js HTTP Module var http = require('http'); Initiate demo_http.js: C:UsersYour Name>node demo_http.js. demo_http_url.js. var http = require('http'); http. createServer(function (req, res) { res. writeHead(200, {'Content-Type': 'text/html'}); res. ... Initiate demo_http_url.js: C:UsersYour Name>node demo_http_url.js.

9. asic function in http module

10. basic function in fs module • Node.js as a File Server • The Node.js file system module allows you to work with the file system on your computer. • To include the File System module, use the require() method: • var fs = require('fs'); • Common use for the File System module: • Read files • Create files • Update files • Delete files • Rename files • Read Files • The fs.readFile() method is used to read files on your computer.

11. What is os module and what does it do? The os module is a built-in Nodejs module that is used to get information about a computer’s operating system. In other words, the os module provides operating system-related utility methods and properties. Syntax const os = require('os'); Now, let’s take a look at some properties and methods of the os module. os.type() os.type() method returns the name of the operating system of the computer. 1 const os = require("os"); 2 3 console.log(os.type())

12. basic function in os module

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