What is the purpose of React and ReactDOM library?

Answer. React is a JavaScript library for building User Interfaces and ReactDOM is the JavaScript library that allows React to interact with the DOM .

React library is responsible for creating views and ReactDOM library is responsible to actually render UI in the browser . Include these two libraries before your main JavaScript file. While learning How React works, we’ll build a small application using react and ReactDOM.

When you encounter an error saying ‘ReactDOM’ is not defined, it means that your application is can’t find the variable ReactDOM because it hasn’t been initialized yet . Generally, “X is not defined error” is caused by wrong import and different letter case between import and the imported variable call.16 Eki 2020

ReactDOM is an object which exposes a number of top-level APIs to interact with the browser DOM . According to the docs, it provides ‘DOM-specific methods that can be used at the top level of your app and as an escape hatch to get outside of the React model if you need to’.