Nodejs Simplified

In this article i will teach you everything you need to know about Nodejs and by the end of this article you will be able to answer any question related to Node.js.

So let’s start with the basic things first.

• What is Node.js?

Nodejs is an open source server environment that is used in backend development. It is free to use. It runs on various platforms (windows, Linux, Unix, Mac OS X, etc.) Nodejs uses JavaScript on the server.

• What Can Nodejs Do?

Nodejs can generate dynamic page content. Node.js can create, open, read, write, delete and close files on the server. Nodejs can collect form data. It can add, delete, modified data in your database

Also Read: Computer Networking Complete Tutorial From Beginner to Advance

• Use Of Nodejs

It is utilized for server-side programming, and essentially conveyed for non-hindering, occasion driven servers, for example, conventional sites and back-end API administrations, however was initially planned with ongoing, push-based structures as a main priority. Each program has its own form of a JS motor, and node.

• Is Node.js Frontend or Backend

Nodejs is basically a runtime climate in light of the V8 Javascript engine for Chrome, which implies it would Javascript be able to out of the executionEve setting of a program.

However, to draw an extremely ambiguous relationship Nodejs is to Javascript is the thing JRE is to Java,(not an exceptionally appropriate examination)

It relies on you with regards to how you would need to use Nodejs.

Since it can run Javascript outside of the setting of a program and furthermore has abilities to run a non-impeding I/O based HTTP Server (with the assistance of http libraries) which it gives out-of-the-case, you can utilize it at the back-end/server side situations.

Additionally you can involve Nodejs in the front end to mechanize your day by day assignments such form , running unit trial of your front end code. Apparatuses like Grunt , Gulp , Bower influence abilities of Node.js in order to improve and upgrade your product advancement.

Additionally as of now Angular 2 is likewise involving Node.js for introducing bundles and assemblage of Typescript to Javascript.

Henceforth , the end is Nodejs practically speaking can be utilized in both front-end and back-end situations, however fundamentally was created to fill the need where Javascript can be utilized in the server side for advancement of web applications, in this manner prompting having a solitary language for both front end and backend improvement

• Node.js vs Python. Which is better

Key distinction: Nodejs is better for web applications and site improvement while Python is best appropriate for back-end applications, mathematical calculations and AI. Nodejs use JavaScript mediator while Python involves CPython as a translator.

• Is Node.js a programming language

Nodejs isn’t a programming language, however it permits engineers to utilize JavaScript, which is a programming language that permits clients to fabricate web applications. This apparatus is generally utilized by developers who use JavaScript to compose Server-Side contents.

• Node.js Interview Questions

1. Describe runtime environment in Node.js?

2. Define Nodejs?

3. What is Node.js process model?

4. What are datatypes in Nodejs?

5. What is a Stub?

6. What are promises in Node.js?

7. How to debug application in Nodejs?

8. What is REPL?

9. What is event emitter in Node.js?

10. What is use of DNS module in Nodejs?

• Node.js Documentation

Click here to read the documentation of Nodejs on official site

• Top 10 Node.js Frameworks

1. Express.js

2. Koa.js

3. Meteor.js

4. Socket.io

5. Nest.js

6. Derby.js

7. Hapi.js

8. Adonis.js

9. LoopBack.js

10. Sails.js

• What is Nodejs File?

Nodejs files contain tasks that will be executed on certain events. A typical event is someone trying to access a port on the server. Nodejs files must be initiated on the server before having any effect. Node.js files have extension .js.

• Nodejs Email

The nodemailer module makes it easy to send emails from your computer. The Nodemailer module can be downloaded and installed using npm:

npm install nodemailer

After you have downloaded the nodemailer module, you can include the module in any application:

let nodemailer = require('nodemailer')

• Node.js Modules

Consider modules to be the same as javascript libraries. A set of functions you want to include in your application.

• Built-in Nodejs Modules

Nodejs has a set of Built-in modules which you can use without any further installation.

• Include Nodejs Modules

To include a module, use the require() function with the name of the module:

let http = require('http')

• Node.js HTTPS Modules

Node.js has a built-in module called HTTP, which allows node.js to transfer data over the Hyper Text Transfer Protocol (HTTP)

To include the HTTP module, use the require() method:

let http = require('http')

Also Read: GitHub Repos That You Won’t Believe Exist

• Node.js As A Web Server

The HTTP module can create an HTTP server that listens to the server ports and gives a response back to the client.

Use the createServer() method to create an HTTP server.

let http = require('http') http.createServer(function (req, res) { res.write('Hello World!') res.end() }).listen(8080)

The function passed into the http.createServer() method, will be executed when someone tries to access the computer on port 8080.

Save the above code in a file called demo_http.js and initiate the file with below command.

node demo_http.js

• URL Modules

The URL module splits up a web address into readable parts.

To include the URL module, use the require() method:

let url = require('url')

Parse an address with the url.parse() method, and it will return a URL object with each part of the address as properties.

Example

let url = require('url') let adr = 'http://localhost:8080/default.htm?year=2022&month=january let q = url.parse(adr, true) console.log(q.host) console.log(q.pathname) console.log(q.search) let qdata = q.query console.log(qdata.month)

• console.log(q.host) returns ‘localhost:8080’

• console.log(q.pathname) returns ‘/default.htm’

• console.log(q.search) returns ‘?year=2022&month=january

• let qdata = q.query returns an object: { year: 2022, month: ‘january’ }

• console.log(qdata.month) returns ‘february’

• Node.js File System

The Node.js system module allows you to work with the file system on your computer.

To include the File System module, use the require() method:

let fs = require(‘fs’)

Common use for the file system module:

Read files

Create files

Update files

Delete files

Rename files

• Best Node.js Tutorials

1. W3Schools

2. TutorialsPoint

3. TutorialsTeacher

4. JavaTPoint

5. GeeksforGeeks

That’s it guys. Hope you liked this article on nodejs, if so please share this article on social media. If you have any doubt or something related to web development, leave a comment below we will get back to you as soon as we can.