Mini Browser VM
Execute JavaScript inside an isolated iframe sandbox. Capture console output, inspect return values, and reset the environment at any time—perfect for quick experiments.
Sandbox editor
Paste or type code, then run it in the isolated VM.
Sample fetch calls require CORS-friendly endpoints. The sandbox uses the same origin security model as the page, so cross-origin restrictions still apply.
Execution metrics
Basic timing data from the last run.
Runtime
—
Times are approximate and measured with performance.now().
Console output
Latest entries are shown first (max 200).
No output yet. Run a snippet to see results here.
Sandbox preview
The iframe runs with sandbox="allow-scripts allow-forms"—no access to parent DOM. Reloading the page resets the context completely.