Node Session - 2
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This document discusses environment setup, modules, and Node Package Manager (NPM) in Node.js. It provides instructions for setting up Node.js, including downloading the .msi file and setting the path. It demonstrates a simple "Hello World" app and describes modules as reusable functionality organized in files. It covers core modules, local modules, and using NPM to install, update, and uninstall Node.js packages.
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Node Session - 2
- 1. Session II ?Techforce Infotech Pvt Ltd 2017-18
- 2. Environment Setup ? Text Editor ? Latest Browser ? Basic Knowledge of Command Prompt Prerequisite
- 3. Environment Setup ? Go to the Node.js official website https://nodejs.org/en/
- 4. Environment Setup ? Run downloaded .msi file
- 5. Environment Setup ? Set nodejs path in environment variable.
- 6. Environment Setup ? Now open CMD and type ¡°npm ¨Cv¡± or ¡°node -v¡±
- 7. Sample Application ? Print ¡®Hello World!¡¯ using Node.js . Console.log(¡®Hello World!¡¯); app.js Output- Hello World!
- 8. ? Module :- Module in Node.js is a simple or complex functionality organized in single or multiple JavaScript files which can be reused throughout the Node.js application. ? Each module in Node.js has its own context, so it cannot interfere with other modules or pollute global scope. Also, each module can be placed in a separate .js file under a separate folder. Modules in Node.js
- 9. Types of Modules ? Core Modules : - These core modules are compiled into its binary distribution and load automatically when Node.js process starts. Core modules is predefined. ? http : - http module includes classes, methods and events to create Node.js http server. ? url :- url module includes methods for URL resolution and parsing. ? querystring :- querystring module includes methods to deal with query string. ? path :- path module includes methods to deal with file paths. ? fs :- fs module includes classes, methods, and events to work with file I/O. ? util :-util module includes utility functions useful for programmers. ? Loading Core Modules :- In order to use Node.js core or NPM modules, you first need to import it using require() function as shown below. var module = require(¡°module_name¡±);
- 10. Types of Modules ? Local Modules : - Local modules are modules created locally in your Node.js application. ? These modules include different functionalities of your application in separate files and folders. You can also package it and distribute it via NPM ? This module is user defined. log.js =====> var log = { info: function (info) { console.log ('Info: ' + info); }, }; module.exports = log Note: - module.exports -> whatever you assign to module.exports or exports, will be exposed as a module.
- 11. ? NPM :- Node Package Manager (NPM) is a command line tool that installs, updates or uninstalls Node.js packages in your application. It is also an online repository for open- source Node.js packages. The node community around the world creates useful modules and publishes them as packages in this repository. ? Install Package locally - > npm install <package_name> ? Install Package globally - > npm install <package_name> - g ? Update Package - > npm update <package_name> ? Uninstall Package - > npm uninstall <package_name> Node Package Manager (NPM)
- 13. Session II completed Address: 403, Venus Benecia, Bodakdev,Ahmedabad ¨C 380053 Reach us : reach@techforceinfotech.com Contact no: +91 (79) 48904529