INTRODUCTION

Welcome to this comprehensive discussion on the Nodejs tutorial. Node.js (Nodejs) is a platform or framework of JavaScript where it helps developers write and use command-line tools and use server-web applications. It is an opened-source function that is used by all contributors globally. It also supports the JavaScript programming language.

  1. What is Node.js?
  2. NPM (Node Package Manager)
  3. Node.js Module
  4. JSON file
  5. Node.js Basics
  6. File System
  7. Events
  8. HTTP Module
  9. Express.js
  10. Nodejs Tutorial Step by step Application Development with Express.js

1.What is Node.js?

The framework developed on Chrome’s V8 JavaScript engine and coordinates with the JavaScript on native machine code is classified as Node.js. It assists in designing server-side web applications and extending the JavaScript API for server-side functionalities. It also helps in various activities such as video streaming sites, single-page applications and many more. With the help of event-driven and I/O model, it takes the data-intensive real-time applications. It also uses the modules and packages. It acts as a library which performs a various function and imported from NPM and used in the programs.

2.NPM (Node Package Manager)

NPM is represented as Node Package Manager. It acts as a manager for the Node.js packages/modules. NPM is added in the node installation in Node version 0.6.0. It assists in installing the npm explicitly hassle-free. NPM helps in hosting the online repositories for the node.js package and modules. It also assists in providing the command-line utility. With the help of it, Node.js packages can be installed, Node.js version can be managed, and dependencies of packages can be installed.

3.Node.js Module

The modules in Node.js are represented as a single and complex functionality present in the form of a Java file that can be used during the processing of web server applications. Each module has its functionality which makes it independent and does not interfere with another module.

Node.js mainly consists of three different modules such as core, local and third-party modules.

4.JSON file

The JSON file in Node.js acts as a heart in the application where it is a manifest file containing the project’s metadata. Hence, it is necessary to work with this file for the Noda project development. A JSON file is mainly categorized into two parts. First, identify metadata properties where the current module version, license, author of the project, project description, project name, and many are mentioned. Second, writing directly to file. Here, one can directly write the necessary information into a JSON file.

A proper Nodejs tutorial would be remiss if we didn’t bring attention to the basics:

5.Node.js Basics

Being the framework of JavaScript, Nodes.js uses JavaScript syntax.

There are three kinds of Nodes.js basics. First is data types which are categorized as primitive data and non-primitive data. Then, variables, operators, functions and objects.

6.File System

Node.js makes use of the F5 module for accessing the physical file system. It mainly takes care of synchronous and asynchronous file I/O operations. This module is used with the help of command

var fs = require (‘fs’) ;

The general module of the file are Read file -fs.readFile(), create file- appendFile(), open() and writeFile(), Update file-fs.appendFile(), fs.writeFile(), Delete file- fs.unlink() and Rename-fs.rename().

7.Events

Nodes.js also supports concurrency in the applications. It makes use of events and callbacks. This support is done with the help of the async function. In actuality, there is a loop that waits and listens for the events and, after their completion, initiates the callback function.

8.HTTP Module

Server-based applications are developed with the bits of help of Nodes.js. Moreover, we can use it to create the web servers that can respond to the client request and are referred to as web modules and provided HTTP module that assist in the processing server request.

9.Express.js

In the server-side applications, express.js is built at the top of node.js and facilitates a data flow between the routes and server in the management. It is a flexible framework and lightweight, which provides various features for web and mobile applications. It makes the developments fast and helps in error handling.

10.Nodejs Tutorial Step by step Application Development with Express.js

So now the question is how to use node.js. To create the Nodes.js with the Express.js for the application development, it is required to sum up various files to facilities the function in the structured process. In that process, the first step will be of creating the package.json and script.js. After this, a folder will be created named view, containing the jade files responsible for the various page views. The files which will be created under this section will be index. jade, log in. jade, welcome.jade, secure.jade and unauthorize.jade. Now, a folder will be created and named as lib. For mapping all the pages, fill will be created route.js.

CONCLUSION

This concludes the discussion regarding the Nodejs tutorial. Here we had studied various terms and concepts which are associated with the nodes.js. Nodejs tutorial showing the creation of files of package.json, script.js, views and lib. Nodes.js is an open-sourced, simple and fast framework, asynchronous, high scalability, single-threaded, buffer-free and cross-platform. It can generate dynamic page content that is opened, read, write, deletes, and modify.

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