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What is React.js?

Originally created by Facebook – for its Instagram app – React JS is now ‘open-source’ and has a huge following among programmers, which means a vast library of resources.
React.JS is an open source JavaScript library which is used for building user interfaces particularly for single page applications. React JS used for handling view layer for web and mobile apps. React JS allow user to create reusable UI components.

React Js was first created by Jordan Walke, Jordan Walke is a software engineer working for Facebook. React JS was first used in Facebook’s newsfeed in 2011 and on Instagram.com in 2012.

React JS is not a framework. It is just a library developed by Facebook to solve some problems that we are facing in making of UI components.

React JS allows developers to create large web applications which can change data, without reloading the page. The main function of React JS is to making web page fast and simple. It works only on user interfaces in application. React JS can be used with a combination of other JavaScript libraries or frameworks, such as Angular JS in MVC.

A React application is made of multiple components, each responsible for interpretation a small, reusable piece of HTML. Components can be nested within other components to allow complex applications to be built out of simple building blocks. A component may also maintain internal state for example; a Tab List component may store a variable corresponding to the currently open tab.


  1. Single Page Application.
  2. Entire page remains same but only few components change.
  3. Code is easy to scale and maintain.
  4. More functionalities as HTML is created from JS
  5. Isomorphic Rendering(Server side rendering)
  6. Blazing speed


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