---
title: Use auxiliary Workers alongside full-stack frameworks
description: Auxiliary Workers are now fully supported when using full-stack frameworks with the Cloudflare Vite plugin
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Use auxiliary Workers alongside full-stack frameworks

Jan 20, 2026 

[ Workers ](https://developers.cloudflare.com/workers/) 

Auxiliary Workers are now fully supported when using full-stack frameworks, such as [React Router](https://developers.cloudflare.com/workers/framework-guides/web-apps/react-router/) and [TanStack Start](https://developers.cloudflare.com/workers/framework-guides/web-apps/tanstack-start/), that integrate with the [Cloudflare Vite plugin](https://developers.cloudflare.com/workers/vite-plugin/reference/api/). They are included alongside the framework's build output in the build output directory. Note that this feature requires Vite 7 or above.

Auxiliary Workers are additional Workers that can be called via [service bindings](https://developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/) from your main (entry) Worker. They are defined in the plugin config, as in the example below:

**vite.config.ts**

```ts
import { defineConfig } from "vite";
import { tanstackStart } from "@tanstack/react-start/plugin/vite";
import { cloudflare } from "@cloudflare/vite-plugin";


export default defineConfig({
  plugins: [
    tanstackStart(),
    cloudflare({
      viteEnvironment: { name: "ssr" },
      auxiliaryWorkers: [{ configPath: "./wrangler.aux.jsonc" }],
    }),
  ],
});
```

See the Vite plugin [API docs](https://developers.cloudflare.com/workers/vite-plugin/reference/api/) for more info.

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