JSX (JavaScript XML)

JSX (JavaScript XML) is a syntax extension for JavaScript that allows you to write HTML-like code within JS code. It is most commonly used with React, a JavaScript library for building user interfaces.

With JSX, you can write code that looks similar to HTML, but it gets transformed into regular JavaScript function calls behind the scenes. It provides a concise and intuitive way to describe the structure and components of your UI, making it easier to visualize and understand your code.

For example, instead of using plain JavaScript to create HTML elements, like this:

const element = document.createElement('h1');
element.textContent = 'Hello, World!';
document.body.appendChild(element);

You can use JSX to achieve the same result in a more declarative way:

const element = <h1>Hello, World!</h1>;
ReactDOM.render(element, document.getElementById('root'));

Behind the scenes, tools like Babel transform JSX code into regular JavaScript code that the browser can understand.