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Run untrusted user-generated JavaScript safely in a browser sandbox.
Runs right here. No download.

WorkerBox is a secure sandbox for executing end-user JavaScript code in isolation, preventing it from affecting your application's DOM. Code runs in its own subdomain and WebWorker, making it suitable for plugin architectures and other scenarios requiring safe execution of untrusted code. The project is free and open source.
Checked by Vibed
Based on what each app takes in and gives out.