A popular JavaScript library for building user interfaces with reusable components.
React is a JavaScript library created by Meta (Facebook) for building user interfaces. Instead of manipulating the DOM directly, React lets you build self-contained components that manage their own state and compose together like LEGO bricks.
React is the most popular frontend library in the world. Key concepts include: JSX (HTML-like syntax in JavaScript), props (passing data between components), Hooks (useState, useEffect) for state and side effects, routing for navigation, and Rendering for displaying UI. React works with HTML, CSS, JSON, and TypeScript.
The React ecosystem includes React Router for navigation (with loaders, actions, Form, useLoaderData, useActionData, useNavigation, and error boundaries), Zustand for global state management, Tailwind CSS for styling, Next.js for full-stack features, and React Native for mobile apps. React connects to backends like Supabase and APIs using Async/Await, Destructuring, Scope, dependencies, and npm packages. Claude Code is exceptionally good at writing React code, managing environment variables, and scaffolding boilerplate.
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