---
title: Durable Objects
description: Specify Durable Objects to add to your environment as follows:
image: https://developers.cloudflare.com/dev-products-preview.png
---

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# Durable Objects

* [Durable Objects Reference](https://developers.cloudflare.com/durable-objects/api/)
* [Using Durable Objects](https://developers.cloudflare.com/durable-objects/)

## Objects

Specify Durable Objects to add to your environment as follows:

JavaScript

```
const mf = new Miniflare({  modules: true,  script: `  export class Object1 {    async fetch(request) {      ...    }  }  export default {    fetch(request) {      ...    }  }  `,  durableObjects: {    // Note Object1 is exported from main (string) script    OBJECT1: "Object1",  },});
```

## Persistence

By default, Durable Object data is stored in memory. It will persist between reloads, but not different `Miniflare` instances. To enable persistence to the file system, specify the Durable Object persistence option:

JavaScript

```
const mf = new Miniflare({  durableObjectsPersist: true, // Defaults to ./.mf/do  durableObjectsPersist: "./data", // Custom path});
```

## Manipulating Outside Workers

For testing, it can be useful to make requests to your Durable Objects from outside a worker. You can do this with the `getDurableObjectNamespace` method.

JavaScript

```
import { Miniflare } from "miniflare";
const mf = new Miniflare({  modules: true,  durableObjects: { TEST_OBJECT: "TestObject" },  script: `  export class TestObject {    constructor(state) {      this.storage = state.storage;    }
    async fetch(request) {      const url = new URL(request.url);      if (url.pathname === "/put") await this.storage.put("key", 1);      return new Response((await this.storage.get("key")).toString());    }  }
  export default {    async fetch(request, env) {      const stub = env.TEST_OBJECT.getByName("test");      return stub.fetch(request);    }  }  `,});
const ns = await mf.getDurableObjectNamespace("TEST_OBJECT");const stub = ns.getByName("test");const doRes = await stub.fetch("http://localhost:8787/put");console.log(await doRes.text()); // "1"
const res = await mf.dispatchFetch("http://localhost:8787/");console.log(await res.text()); // "1"
```

## Using a Class Exported by Another Script

Miniflare supports the `script_name` option for accessing Durable Objects exported by other scripts. This requires mounting the other worker as described in [🔌 Multiple Workers](https://developers.cloudflare.com/workers/testing/miniflare/core/multiple-workers).

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