The Playground
Write and run code in your browser. JavaScript and Python both work without any install. Your code is saved locally — close the tab and it'll still be here when you come back.
Output
Tips
- Ctrl+Enter (or Cmd+Enter) runs the code.
- Switching languages saves your current code first — switch back any time.
- Python: the first run downloads ~10MB of Python runtime. Subsequent runs are instant.
- JavaScript runs in a sandboxed function.
alert()won't work; useconsole.log(). - HTML mode renders the document live in an iframe.