function App() { return <div>你好，世界！</div> }
This React live editor online runs JSX in your browser with instant preview—no local setup required. React is a widely used UI library; writing and debugging components and JSX often benefits from a quick way to run snippet code.
Enter React component code in the editor (JSX and Hooks such as useState, useEffect). If the tool offers samples or multiple files, start from a sample and then edit.
The preview area shows the rendered component. Edits usually trigger a refresh; if not, click "Run" or "Refresh" to see the latest result.
Good for quickly trying a piece of JSX, debugging simple interactions, or demonstrating component behavior. For large projects or many dependencies, use a local setup or a full online IDE.
Typically function components, Hooks (useState, useEffect, etc.), and common JSX. Server Components, some experimental APIs, or build-time features may not be available—check the tool’s documentation.
If the Playground preloads or supports CDN/module resolution, you can use declared libraries; undeclared dependencies may fail to load. For heavy dependencies, use a local or full online IDE.
Persistence and uploads depend on the tool’s policy. Do not paste sensitive code, or use only in environments you trust.
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