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