React JS and JSX are related concepts but serve different purposes in the context of React, a popular JavaScript library for building user interfaces.
-
React JS:
React JS is the JavaScript library itself, created and maintained by Facebook. It allows developers to build reusable UI components using a declarative approach. React helps manage the state and lifecycle of these components, and efficiently update and render the DOM when data changes. React can be used for both web and mobile application development.
-
JSX:
JSX, on the other hand, is a syntax extension for JavaScript. It allows developers to write HTML-like code within their JavaScript code. JSX is not mandatory to use with React, but it is widely adopted because it makes the code more readable and easier to understand. JSX is converted to plain JavaScript during the build process, typically using a tool like Babel.
| Feature | React JS | JSX |
|---|---|---|
| Definition | A JavaScript library for building user interfaces. | A syntax extension for JavaScript. |
| Purpose | Managing component state and rendering efficiently. | Enhancing code readability and expressiveness. |
| Usage | Creating reusable UI components. | Writing HTML-like code within JavaScript. |
| Dependencies | Standalone library. | Used with React, but not mandatory. |
| Conversion | N/A | Transpiled to plain JavaScript using Babel or similar tools. |
| Syntax | JavaScript code with optional JSX. | HTML-like syntax within JavaScript. |
| Compatibility | Works with various front-end libraries and frameworks. | Specific to React ecosystem. |
In summary, React JS is the library used for building UI components, while JSX is a syntax extension that helps developers write more readable and expressive code when working with React.