Node Session - 2

1. Session II
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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 –v” 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)

12. Session II
completed
Thank You

13. Session II
completed
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