React.js (also known as ReactJS or React) is an open-source, front-end JavaScript library. It was created in 2013 by Jordan Walke, who works at Facebook as a software engineer.
Now, it has the MIT license but was initially released under the Apache License 2.0. React was designed to make interactive UI creations painless.
Just design a simple view for individual states in your app. Next, it will render and update the right component efficiently upon data changes.


  • The React code comprises components or entities that need rendering to a specific element in DOM with the help of a React DOM library.
  • It uses a virtual DOM by creating an in-memory cache in a data structure, computing the difference, and updating the display DOM in the browser efficiently.
  • Due to this selective rendering, the app performance boosts while saving the developers’ efforts in recalculating the page layout, CSS styles, and full-page rendering.
  • It uses lifecycle methods like render and componentDidMount to allow code execution at specific points during an entity’s lifetime. I- t supports JavaScript XML (JSX) that combines both JS and HTML. It helps in component rendering with nested elements, attributes, JS expressions, and conditional statements.

Use cases:

  • Serving as the base while developing mobile or single-page applications.
  • Rendering a state to the DOM and manages it.
  • Building efficient user interfaces while developing web applications and interactive sites.
  • Debugging and testing more easily.

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