What is JSX

JavaScript XML (JSX) is a unique syntax extension introduced by React that allows us to write JavaScript that looks like HTML.

Why JSX?

JSX may seem strange at first, but it is a powerful tool that combines the best parts of JavaScript and HTML. With JSX, we can write components that are more readable and easier to understand at a glance.

Here are some benefits of JSX:

  • Familiar Syntax: JSX's syntax is very similar to HTML, so it's easy to set up and get going quickly.
  • Inline Styles: In JSX, you can create inline styles using JavaScript objects and camelCased properties.
  • Logic and Markup in One Place: Because JSX is a part of JavaScript, you can mix logic and markup in your component files.

Creating a React Component with JSX

In the project we just created

1. Delete all the contents of App.jsx

2. Writing Your Component

Now write the following code:

import React from 'react';

function App() {
  return <h1>Hello, world!</h1>;

export default App;

What this does is it defines a new function App, which becomes our component. This function returns what we want to display in the browser - in this case, an h1 tag with the text Hello, world!.

This is JSX! It looks like HTML, but it's JavaScript.

3. Checking the Result

If you now run your React app by typing npm dev in the terminal, you should see the text Hello, world! on your screen.

Congratulations, you've just written your first React component using JSX!