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

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# D1

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/workers/testing/miniflare/storage/d1/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

* [D1 Reference](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/d1/)

## Databases

Specify D1 Databases to add to your environment as follows:

```js
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:

```js
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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