Nodejs Tutorial – An Important Guide For Beginners 2021

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
  11. Tips For Node JS Interview Questions

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 an event-driven and I/O model, it takes the data-intensive real-time applications. It also uses modules and packages. It acts as a library that performs various functions and is 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 versions 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 modules: core, local and third-party.

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, working with this file for the Noda project development is necessary. 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 others are mentioned. Second, write directly to the 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 a 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 web servers that can respond to the client request and are referred to as web modules and provided HTTP modules that assist in processing server requests.

9.Express.js

In 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 and lightweight framework, providing various web and mobile application features. 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 facilitate the function in the structured process. In that process, the first step will be to create 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 indexed. jade, log in. jade, welcome.jade, secure.jade and unauthorize.jade. Now, a folder will be created and named lib. For mapping all the pages, fill will be created route.js.

11. Tips For Node JS Interview Questions

The most important topics to prepare for coding node JS interview questions are data structure, algorithm-based, conceptual, and general questions. Here are some tips and tricks to prepare for the coding node JS interview questions.

  • Learn Basics

Keep your basics clear before going for the node JS interview. Learn all the fundamental concepts. There are many online tutorials to learn node JS from scratch providing detailed knowledge about node JS data structures and algorithms. You can learn through online tutorials or refer to the best book for node JS.

  • Practice on paper

After building up the basic prerequisite for node JS, practice the concepts you have learned because they can lead you to success in any domain. The same applies here to unravel the coding node JS interview questions. Train yourself to promptly solve algorithm problems and acquire analytical skills to solve unexpected node JS interview questions during the final interview. 

  • Mock interview

Another necessary tip for answering node JS interviews for coding is to take as many mock node JS interviews as possible. The more mock interviews you take, the more you boost your confidence for your final node JS interview. Mock interviews train you to answer different node JS interview questions you will face in the interview. 

Node JS interview questions are deemed to be challenging to answer. You can get the node JS developer job with practice and effort in the right direction. The above node JS tips and tricks to answer questions will help you to crack the interview. Practice as many mock node JS interview questions as possible. Prepare wisely and ace your node JS interview.

CONCLUSION

This concludes the discussion regarding the Nodejs tutorial. Here we 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-source, simple, and fast framework, asynchronous, high scalability, single-threaded, buffer-free, and cross-platform. It can generate dynamic page content that is opened, read, written, deleted, and modified.

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