---
title: D1
description: Specify D1 Databases to add to your environment as follows:
image: https://developers.cloudflare.com/dev-products-preview.png
---

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# D1

* [D1 Reference](https://developers.cloudflare.com/d1/)

## Databases

Specify D1 Databases to add to your environment as follows:

JavaScript

```
const mf = new Miniflare({  d1Databases: {    DB: "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",  },});
```

## Working with D1 Databases

For testing, it can be useful to put/get data from D1 storage bound to a Worker. You can do this with the `getD1Database` method:

JavaScript

```
const db = await mf.getD1Database("DB");const stmt = await db.prepare("<Query>");const returnValue = await stmt.run();
return Response.json(returnValue.results);
```

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