Free Online JavaScript Playground / REPL

Your code runs directly in your browser using the built-in JavaScript engine (via eval). Nothing is sent to a server, so it works offline and your code stays on your machine.

Anything you pass to console.log() appears in the Console output panel. The value of the last evaluated expression is shown in the Result panel.

Yes. The playground uses your browser's engine, so any ES features your browser supports (arrow functions, async/await, destructuring, optional chaining, and more) work out of the box. Node.js-only APIs such as require() and fs are not available in the browser sandbox.

Yes. Click Share to copy a URL that encodes your current code, so anyone who opens the link sees the same program.

Chat opens an AI assistant embedded in the playground. It can explain JavaScript concepts, debug errors, and write code directly into the editor, then run it to verify the result.