Node.js is an elegant, server-side, JavaScript development environment suitable for scalable, high-performance web applications.

Now, in response to customer demand, it has moved to the server side with Realm Node.js and opened up the new product to more developers using Node's popular npm package manager for JavaScript code.

Lastly, index.js serves as the starting point for the NodeJS process and ReactDOM.hydrate () is used to flesh out our app with less important auxiliary content after the shell loads.