Cloudflare Workers KV

Create a global, low-latency, key-value data storage.

Available on Free and Paid plans

Workers KV is a data storage that allows you to store and retrieve data globally. With Workers KV, you can build dynamic and performant APIs and websites that support high read volumes with low latency.

For example, you can use Workers KV for:

• Caching API responses.
• Storing user configurations / preferences.
• Storing user authentication details.

Access your Workers KV namespace from Cloudflare Workers using Workers Bindings or from your external application using the REST API:

Workers Binding API

index.ts

export default {
  async fetch(request, env, ctx): Promise<Response> {
    // write a key-value pair
    await env.KV_BINDING.put('KEY', 'VALUE');

      // read a key-value pair
      const value = await env.KV_BINDING.get('KEY');

      // list all key-value pairs
      const allKeys = await env.KV_BINDING.list();

      // delete a key-value pair
      await env.KV_BINDING.delete('KEY');

      // return a Workers response
      return new Response(
        JSON.stringify({
          value: value,
          allKeys: allKeys,
        }),
      );
    },

} satisfies ExportedHandler<{ KV_BINDING: KVNamespace }>;

wrangler.jsonc

{
  "$schema": "node_modules/wrangler/config-schema.json",
  "name": "WORKER-NAME",
  "main": "src/index.ts",
  "compatibility_date": "2025-02-04",
  "observability": {
    "enabled": true
  },

  "kv_namespaces": [
    {
      "binding": "KV_BINDING",
      "id": "<YOUR_BINDING_ID>"
    }
  ]
}

See the full Workers KV binding API reference.

REST API

cURL

curl https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/storage/kv/namespaces/$NAMESPACE_ID/values/$KEY_NAME \
    -X PUT \
    -H 'Content-Type: multipart/form-data' \
    -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
    -H "X-Auth-Key: $CLOUDFLARE_API_KEY" \
    -d '{
      "value": "Some Value"
    }'

curl https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/storage/kv/namespaces/$NAMESPACE_ID/values/$KEY_NAME \
    -H "X-Auth-Email: $CLOUDFLARE_EMAIL" \
    -H "X-Auth-Key: $CLOUDFLARE_API_KEY"

TypeScript

const client = new Cloudflare({
  apiEmail: process.env['CLOUDFLARE_EMAIL'], // This is the default and can be omitted
  apiKey: process.env['CLOUDFLARE_API_KEY'], // This is the default and can be omitted
});

const value = await client.kv.namespaces.values.update('<KV_NAMESPACE_ID>', 'KEY', {
  account_id: '<ACCOUNT_ID>',
  value: 'VALUE',
});

const value = await client.kv.namespaces.values.get('<KV_NAMESPACE_ID>', 'KEY', {
  account_id: '<ACCOUNT_ID>',
});

const value = await client.kv.namespaces.values.delete('<KV_NAMESPACE_ID>', 'KEY', {
  account_id: '<ACCOUNT_ID>',
});

// Automatically fetches more pages as needed.
for await (const namespace of client.kv.namespaces.list({ account_id: '<ACCOUNT_ID>' })) {
  console.log(namespace.id);
}

See the full Workers KV REST API and SDK reference for details on using REST API from external applications, with pre-generated SDK's for external TypeScript, Python, or Go applications.

Get started

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Features

Key-value storage

Learn how Workers KV stores and retrieves data.

Use Key-value storage

Wrangler

The Workers command-line interface, Wrangler, allows you to create, test, and deploy your Workers projects.

Use Wrangler

Bindings

Bindings allow your Workers to interact with resources on the Cloudflare developer platform, including R2, Durable Objects, and D1.

Use Bindings

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Related products

R2

Cloudflare R2 Storage allows developers to store large amounts of unstructured data without the costly egress bandwidth fees associated with typical cloud storage services.

Durable Objects

Cloudflare Durable Objects allows developers to access scalable compute and permanent, consistent storage.

D1

Built on SQLite, D1 is Cloudflare’s first queryable relational database. Create an entire database by importing data or defining your tables and writing your queries within a Worker or through the API.

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More resources

Limits

Learn about KV limits.

Pricing

Learn about KV pricing.

Discord

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Twitter

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