What is React Js? Features of React Js

Did you hear about React Js? Today I am going to give you complete information about React JS and will tell you, what is React Js? Why React Js are used? And many more. Let’s start this post.

React Js is the most popular and famous library in the field of web development. It is used by very big companies such as Netflix, Instagram, Airbnb, etc.

React Js comes with a lot of features, that’s why it is used more than others, such as some frameworks, AngularJS, etc.

Note: React JS is a JavaScript library, not a framework

React js is a javascript library that was created for web applications and mobile apps with a fast and interactive UI. Let us now know the complete information about React js.

What is React Js Features of React Js

What is React Js?

React JS is an open-source, front-end Javascript library from which UI interfaces are built.

It is a declarative, efficient, and flexible Javascript library using which reusable UI components are created.

Like I said earlier this is an open-source, component-based frontend library using which the view layer of the application is created.

It was made by Facebook and is maintained by Facebook itself and is also used to make other Facebook products such as Instagram and WhatsApp.

By using React js, the user interface gets converted into smaller components that are very easy to handle.

Let us now know about the use of React Js.

Why is React JS used?

The main task of React Js is to create user interfaces that are quick and also increase the speed of the app. It uses virtual DOM, due to which the performance of the app created by it is very good.

JavaScript virtual DOM is much faster than regular DOM.

Let us know the use of React js and why it is used.

  • The complex application using React Js develops very easily and quickly.
  • React Js uses virtual DOM due to which the application becomes fast and its performance improves.
  • Reusable components can be made using React Js, which saves time.
  • React JS is very easy to learn.
  • Mobile apps can be created along with the web using React.
  • In this, the code can debug very easily.

Who made React and when? – Brief history of React

React JS was created by a Facebook software engineer named Jordan Walke. The first prototype of React JS that was released was named “FaxJS”. Jordan was inspired by PHP’s HTML component library and built React JS.

React JS was first used in Facebook’s news feeds in 2011, and then in 2012 in Instagram. In May 2013, React Js was made open source.

Features of React JS

The popularity of this javascript library, React JS among all other javascript frameworks is gaining popularity. It has contributed immensely to front-end development.

Let us now know about its features, due to which it became popular with everyone:

  • JSX
  • Components
  • One-way Data Binding
  • Virtual DOM
  • Simplicity
  • Performance


JSX has a full form, Javascript XML. This is a javascript system extension.

Its syntax is like HTML and XML which is used by React JS.

This syntax is processed in javascript calls of the React framework.


React JS applications run only using components, where each component has its own properties and a lot of components are made from one app.

One way data binding

React Js are designed in such a way that it uses a unidirectional data flow or one-day data binding. With the help of this feature, the control of the app is even better.

Virtual DOM

Virtual DOM object represents the original DOM object. Whenever the UI is modified, the entire UI is re-rendered into virtual DOM representation.

It then finds out the difference between the old DOM and the new one, once this is done then all the changes are updated in the real DOM.


React JS uses a JSX file which makes the application and coding easy. It is easy to learn and its reusable feature also makes it easy to code.


React JS feels very good about his performance. This javascript library makes it better than all other frameworksThis feature, which is achieved because of virtual DOM.

React JS code example

<div id="myReactApp"></div>
<script type="text/babel">
function Greeter(props) {
return <h1>{props.greeting}</h1>
var App = <Greeter greeting="Hello World!" />;
ReactDOM.render(App, document.getElementById('myReactApp'));

The code written in React js looks like this.

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So friend, in today’s post, you know what React JS is and why it is used, you also learned how React JS works. It is also known that React JS is preferred more than the rest of the javascript framework.

I hope that you have got complete information about React JS from my mentioned post.

If you want to know or tell anything more about React JS, then feel free to comment on us, we will be very happy to help you and learn something new from you.

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