---
title: Durable Objects
description: Specify Durable Objects to add to your environment as follows:
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

> Documentation Index  
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# Durable Objects

* [Durable Objects Reference](https://edgetunnel-b2h.pages.dev/durable-objects/api/)
* [Using Durable Objects](https://edgetunnel-b2h.pages.dev/durable-objects/)

## Objects

Specify Durable Objects to add to your environment as follows:

**JavaScript**

```js
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**

```js
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**

```js
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://edgetunnel-b2h.pages.dev/workers/testing/miniflare/core/multiple-workers).

```json
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```