JavaScript Playground
Free online JavaScript playground, run code in browser
JavaScript Playground
Write and execute JavaScript code directly in the browser. The playground supports console.log output, error reporting, and timing measurement. It is useful for quick experiments, algorithm testing, and learning JavaScript.
How to Use the Playground
Write JavaScript code in the editor. Click Run (or use keyboard shortcut) to execute. Console output appears in the output panel. Execution time is displayed. Use try/catch for error handling in your code.
▶Is there a timeout for long-running code?
Yes, the playground has a timeout to prevent infinite loops from freezing your browser. If your code takes too long, it will be interrupted.
▶Can I use async/await?
Yes, the playground supports modern JavaScript features including async/await, Promises, arrow functions, destructuring, and template literals.
▶What APIs are available?
You have access to standard browser APIs including fetch, localStorage, crypto, and the DOM. Some APIs may be restricted for security.