React - JavaScript library for building user interfaces

React is a JavaScript library for building user interfaces. Lots of people use React as the V in MVC. React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. React can also render on the server using Node and power mobile apps using React Native.

React components implement a render() method that takes input data and returns what to display. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep state out of the DOM.