ReactJS is a popular Javascript frontend development framework originally developed by Facebook, but currently in wide use also by many other companies. React builds on Node.JS, NPM and various other Javascript components and technologies as development tools, but executes fully in the browser once compiled, and can also be used together with many different backend server technologies. This tutorial provides a short introduction to developing React.JS applications.

In this tutorial, we will learn how to create a web-based BMI (Body Mass Index) calculator application using React.JS