Use JavaScript Playground
Run JavaScript in an isolated worker inside a sandboxed frame. Edit the sample and choose Run JavaScript. Use Stop or Reset runner to end execution.
Behavior and limits
Run JavaScript in an isolated worker inside a sandboxed frame. The runner has no site cookies or storage and network requests are blocked. No DOM or module imports are available. Execution starts explicitly, is terminated after five seconds, and can be stopped or reset. Console output is bounded; it is not saved automatically.
Example input
console.log("Hello, playground");
const total = [1, 2, 3].reduce((a, b) => a + b, 0);
console.log({ total });
return total;Expected behavior for the example
Logs Hello, playground and an object with total 6, then reports the return value 6.
Check important output in the application that will consume it. Use the tool directory to find related formats and tasks.
Frequently asked questions
How does JavaScript Playground handle my input?
Run JavaScript in an isolated worker inside a sandboxed frame. The runner has no site cookies or storage and network requests are blocked. No DOM or module imports are available. Execution starts explicitly, is terminated after five seconds, and can be stopped or reset. Console output is bounded; it is not saved automatically.
Is my input uploaded or saved automatically?
Processing runs locally in this browser. Input and results are not saved automatically. Downloads happen only when you choose them. The static preview blocks scripts and external resources when one is available.