How to use JavaScript Editor Online
- Drop your text into the field at the top of JavaScript Editor Online.
- Hit Run — the processed output appears below at once.
- Use Copy to keep or reuse the result.
About this tool
There is no server behind JavaScript Editor Online. JavaScript Editor Online executes your snippet in an isolated sandbox and prints the console output, all on your device.
The sandbox has no access to this page, your cookies or your storage, so your code cannot affect the site around it. Your code runs in a sandboxed iframe isolated from this page, with no access to your cookies or storage, and nothing you write is uploaded.
Frequently asked questions
How do I use JavaScript Editor Online?
JavaScript Editor Online lets you process your input right in the browser, with the result shown instantly and nothing uploaded.
Is JavaScript Editor Online free to use?
Yes — JavaScript Editor Online is completely free, with no usage limits.
Does JavaScript Editor Online upload my data?
No — JavaScript Editor Online processes everything locally in your browser, so nothing you enter is uploaded or stored.
Is the code in JavaScript Editor Online really sandboxed?
Yes — JavaScript Editor Online runs your code in an iframe with the sandbox attribute and a separate origin, so it cannot read this page, your cookies or your storage.
Does JavaScript Editor Online work offline?
Once the page has loaded, JavaScript Editor Online keeps working with no network connection.