W3Schools.com (2024)

Learning by Examples

Our "Show React" tool makes it easy to demonstrate React. It shows both the code and the result.

import React from 'react';import ReactDOM from 'react-dom/client';function Hello(props) { return <h1>Hello World!</h1>;}const container = document.getElementById("root");const root = ReactDOM.createRoot(container);root.render(<Hello />);

Learning by Exercises

Many chapters in this tutorial end with an exercise where you can check you level of knowledge.

See all React Exercises

React Quiz

Test your React skills with a quiz.

React Quiz

My Learning

Track your progress with the free "My Learning" program here at W3Schools.

Log in to your account, and start earning points!

This is an optional feature. You can study at W3Schools without using My Learning.

Create React App

To learn and test React, you should set up a React Environment on your computer.

This tutorial uses the create-react-app.

The create-react-app tool is an officially supported way to create React applications.

Node.js is required to use create-react-app.

Open your terminal in the directory you would like to create your application.

Run this command to create a React application namedmy-react-app:

create-react-app will set up everything you need to run a React application.

Note:If you've previously installed create-react-app globally,it is recommended that you uninstall the package to ensure npx always uses the latest version ofcreate-react-app.To uninstall, run this command: npm uninstall -g create-react-app.

Run the React Application

Run this command to move to the my-react-app directory:

Run this command to execute the React application my-react-app:

A new browser window will pop up with your newly created React App! If not, open your browser and type localhost:3000 in the address bar.

The result:

You will learn more about the create-react-app in the React Get Started chapter.

What You Should Already Know

Before starting with React.JS, you should have intermediate experience in:

• HTML
• CSS
• JavaScript

You should also have some experience with the new JavaScript features introduced in ECMAScript 6 (ES6), you will learn about them in the React ES6 chapter.