Demonstrates Dynamic Worker Loaders — spin up sandboxed, disposable isolates at runtime from a host Worker.

npm install   # from the repo root
npm start     # from this directory

The host Worker exposes a /api/run endpoint. The React frontend sends user-written code to it, and the server loads it into a one-off dynamic isolate:

const worker = env.LOADER.load({
  compatibilityDate: "2026-01-28",
  mainModule: "worker.js",
  modules: {
    "worker.js": code
  },
  globalOutbound: null
});

const result = await worker
  .getEntrypoint()
  .fetch(new Request("https://worker/"));

• LOADER.load() — creates a one-off dynamic isolate
• globalOutbound: null — blocks all outbound network access from the dynamic Worker

• Dynamic Worker Loaders docs
• Cloudflare Workers docs