---
title: Dynamic Workers Starter
description: A starter template for deploying a Worker that loads and runs Dynamic Workers.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

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# Dynamic Workers Starter

A [starter template ↗](https://github.com/cloudflare/agents/tree/main/examples/dynamic-workers) for deploying a Worker that loads and runs [Dynamic Workers](https://edgetunnel-b2h.pages.dev/dynamic-workers/).

[![Deploy to Workers](https://deploy.workers.cloudflare.com/button)](https://deploy.workers.cloudflare.com/?url=https://github.com/cloudflare/agents/tree/main/examples/dynamic-workers)

## What it does

This template demonstrates how to use the [Worker Loader API](https://edgetunnel-b2h.pages.dev/workers/runtime-apis/bindings/worker-loader/) to execute code at runtime. The host Worker exposes an `/api/run` endpoint that accepts code from the frontend, loads it into a sandboxed Dynamic Worker, and returns the result.

Use this pattern for AI agents that need to execute a snippet of code to complete an action.

## Configuration

Add a `worker_loaders` binding to your Wrangler file:

* [  wrangler.jsonc ](#tab-panel-9162)
* [  wrangler.toml ](#tab-panel-9163)

**JSONC**

```jsonc
{
  "worker_loaders": [
    {
      "binding": "LOADER"
    }
  ]
}
```

**TOML**

```toml
[[worker_loaders]]
binding = "LOADER"
```

## Loading and executing a Dynamic Worker

In this example:

* `env.LOADER.load()` creates a one-off dynamic isolate
* `globalOutbound: null` blocks all outbound network access from the Dynamic Worker

* [  JavaScript ](#tab-panel-9164)
* [  TypeScript ](#tab-panel-9165)

**JavaScript**

```js
export default {
  async fetch(request, env) {
    const { code } = await request.json();


    const worker = env.LOADER.load({
      compatibilityDate: "2026-05-01",
      mainModule: "worker.js",
      modules: {
        "worker.js": code,
      },
      // Block all outbound network access
      globalOutbound: null,
    });


    const result = await worker.getEntrypoint().fetch(request);
    return result;
  },
};
```

**TypeScript**

```ts
export default {
  async fetch(request, env): Promise<Response> {
    const { code } = await request.json();


    const worker = env.LOADER.load({
      compatibilityDate: "2026-05-01",
      mainModule: "worker.js",
      modules: {
        "worker.js": code,
      },
      // Block all outbound network access
      globalOutbound: null,
    });


    const result = await worker.getEntrypoint().fetch(request);
    return result;
  },
} satisfies ExportedHandler;
```

## Running locally

```sh
npm install
npm run dev
```

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