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

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# KV

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/kv/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

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

## Namespaces

Specify KV namespaces to add to your environment as follows:

```js
const mf = new Miniflare({
	kvNamespaces: ["TEST_NAMESPACE1", "TEST_NAMESPACE2"],
});
```

You can now access KV namespaces in your workers:

```js
export default {
	async fetch(request, env) {
		return new Response(await env.TEST_NAMESPACE1.get("key"));
	},
};
```

Miniflare supports all KV operations and data types.

## Manipulating Outside Workers

For testing, it can be useful to put/get data from KV outside a worker. You can do this with the `getKVNamespace` method:

```js
import { Miniflare } from "miniflare";

const mf = new Miniflare({
	modules: true,
	script: `
  export default {
    async fetch(request, env, ctx) {
      const value = parseInt(await env.TEST_NAMESPACE.get("count")) + 1;
      await env.TEST_NAMESPACE.put("count", value.toString());
      return new Response(value.toString());
    },
  }
  `,
	kvNamespaces: ["TEST_NAMESPACE"],
});

const ns = await mf.getKVNamespace("TEST_NAMESPACE");
await ns.put("count", "1");

const res = await mf.dispatchFetch("http://localhost:8787/");
console.log(await res.text()); // 2
console.log(await ns.get("count")); // 2
```

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