---
title: Use the Cache API
description: Store R2 objects in Cloudflare's cache using the Workers Cache API for faster retrieval.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/r2/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Use the Cache API

Use the [Cache API](https://developers.cloudflare.com/workers/runtime-apis/cache/) to store R2 objects in Cloudflare's cache.

Note

You will need to [connect a custom domain](https://developers.cloudflare.com/workers/configuration/routing/custom-domains/) or [route](https://developers.cloudflare.com/workers/configuration/routing/routes/) to your Worker in order to use the Cache API. Cache API operations in the Cloudflare Workers dashboard editor, Playground previews, and any `*.workers.dev` deployments will have no impact.

JavaScript

```
export default {  async fetch(request, env, context) {    try {      const url = new URL(request.url);
      // Construct the cache key from the cache URL      const cacheKey = new Request(url.toString(), request);      const cache = caches.default;
      // Check whether the value is already available in the cache      // if not, you will need to fetch it from R2, and store it in the cache      // for future access      let response = await cache.match(cacheKey);
      if (response) {        console.log(`Cache hit for: ${request.url}.`);        return response;      }
      console.log(        `Response for request url: ${request.url} not present in cache. Fetching and caching request.`      );
      // If not in cache, get it from R2      const objectKey = url.pathname.slice(1);      const object = await env.MY_BUCKET.get(objectKey);      if (object === null) {        return new Response('Object Not Found', { status: 404 });      }
      // Set the appropriate object headers      const headers = new Headers();      object.writeHttpMetadata(headers);      headers.set('etag', object.httpEtag);
      // Cache API respects Cache-Control headers. Setting s-max-age to 10      // will limit the response to be in cache for 10 seconds max      // Any changes made to the response here will be reflected in the cached value      headers.append('Cache-Control', 's-maxage=10');
      response = new Response(object.body, {        headers,      });
      // Store the fetched response as cacheKey      // Use waitUntil so you can return the response without blocking on      // writing to cache      context.waitUntil(cache.put(cacheKey, response.clone()));
      return response;    } catch (e) {      return new Response('Error thrown ' + e.message);    }  },};
```

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