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Playground

JavaScript playground

Your code runs on the browser's own JavaScript engine, inside the same network-isolated sandbox everything else here uses. There is nothing to download, so the first run happens immediately. How the sandbox works, and its honest limits, is on the code execution and security page.

the browser's own JavaScript engine

Ctrl/Cmd+Enter to run

Press Esc then Tab to move keyboard focus out of the code editor.

Ready
Output will appear here after you run your code.

Not sure what to type?

A blank editor is the hard place to start. The JavaScript exercises hand you a program that already runs and ask you to change one thing.

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