KV (2)

Last updated Jan 28, 2026 - KV Reference

Namespaces

Specify KV namespaces to add to your environment as follows:

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

You can now access KV namespaces in your workers:

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:

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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