JavaScript Runner
Execute JavaScript code instantly in your browser. Powered by a sandboxed iframe — fully client-side, no server required.
Code
Output
// Output will appear here
Frequently Asked Questions
Yes. Code runs inside a sandboxed iframe with no access to the parent page, cookies, or localStorage. The sandbox attribute restricts capabilities to script execution only.
You can run any standard JavaScript — array operations, string manipulation, math, objects, async/await, and more. It's great for quick prototyping, algorithm testing, and learning.
No. All execution happens locally in your browser. Nothing is transmitted over the network.
DOM manipulation, window, document, external network requests (fetch/XHR), and browser APIs are not available inside the sandbox.