React Quickstart Tutorial
Run the React Application
You will learn more about JSX in the React JSX chapter.
Include three CDN's in your HTML file:. This way of using React can be OK for testing purposes, but for production you will need to set up a React environment.
Complete the React modules, do the exercises, take the exam and become w3schools certified!!
If you have npx and Node.js installed, you can create a React application by using create-react-app.
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 of create-react-app.
To uninstall, run this command: npm uninstall -g create-react-app.
Run this command to create a React application namedmy-react-app:. The create-react-app will set up everything you need to run a React application.
Now you are ready to run your first real React application! Run this command to move to the my-react-app directory:.
Run this command to run 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. So far so good, but how do I change the content? Look in the my-react-app directory, and you will find a src folder.
Add React Router
Inside thesrc folder there is a file called App.js, open it and it will look like this:.
Try changing the HTML content and save the file. Notice that the changes are visible immediately after you save the file, you do not have to reload the browser!
Replace all the content inside the
element. See the changes in the browser when you click Save.
Notice that we have removed the imports we do not need (logo.svg and App.css).
Now you have a React Environment on your computer, and you are ready to learn more about React.
In the rest of this tutorial we will use our "Show React" tool to explain the various aspects of React, and how they are displayed in the browser.
- If you want to follow the same steps on your computer, start by stripping down the src folder to only contain one file: index.js.
- You should also remove any unnecessary lines of code inside the index.js file to make them look like the example in the "Show React" tool below:.
- Click the "Run Example" button to see the result.