What is JSX?

JSX, which stands for JavaScript XML, is a syntax extension for JavaScript commonly used with React to describe what the user interface should look like. It allows developers to write HTML-like code directly within JavaScript, making the code more readable and easier to write when building React components. In essence, JSX looks very similar to HTML but it’s not a string or HTML — it’s syntactic sugar for React.createElement() calls. Under the hood, JSX is transformed into plain JavaScript objects called “React elements” by tools like Babel during the build process. These elements represent the structure of the UI and are used by React to efficiently update the DOM. For example, instead of writing: ```javascript React.createElement('div', null, 'Hello, world!'); ``` you can write: ```jsx Hello, world! ``` This makes components more intuitive to develop and maintain. JSX also supports embedding JavaScript expressions within curly braces `{}`, enabling dynamic rendering of content. In summary, JSX is a powerful and convenient way to write UI components in React, combining the expressive power of JavaScript with the familiar syntax of HTML.

JSX stands for JavaScript XML. It is a syntax extension for JavaScript commonly used with React to describe what the UI should look like. Instead of using traditional JavaScript function calls to create React elements, JSX allows developers to write code that closely resembles HTML or XML, making the code more readable and declarative. In React, JSX lets you write tags that represent React elements, which the React library then transforms into JavaScript calls that create these elements. For example, instead of writing `React.createElement('div', null, 'Hello World')`, you can simply write `Hello World` inside your JavaScript code. Under the hood, JSX is compiled by tools like Babel into standard JavaScript before it runs in the browser. Using JSX improves developer experience by providing a clear and intuitive way to structure UI components. It also supports embedding JavaScript expressions within curly braces `{}`, allowing dynamic content to be rendered easily. However, JSX is optional in React—you can write React components without it—but it has become the preferred way due to its simplicity and expressiveness.