CacheStorage: delete() method

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The delete() method of the CacheStorage interface finds the Cache object matching the cacheName, and if found, deletes the Cache object and returns a Promise that resolves to true. If no Cache object is found, it resolves to false.

You can access CacheStorage through the Window.caches property in windows or through the WorkerGlobalScope.caches property in workers.

Syntax

js
delete(cacheName)

Parameters

cacheName

The name of the cache you want to delete.

Return value

a Promise that resolves to true if the Cache object is found and deleted, and false otherwise.

Examples

In this code snippet we wait for an activate event, and then run a waitUntil() block that clears up any old, unused caches before a new service worker is activated. Here we have an array of cache names we want to keep (cachesToKeep). We return the keys of the caches in the CacheStorage object using CacheStorage.keys, then check each key to see if it is in the array. If not, we delete it using delete().

js
this.addEventListener("activate", (event) => {
  const cachesToKeep = ["v2"];

  event.waitUntil(
    caches.keys().then((keyList) =>
      Promise.all(
        keyList.map((key) => {
          if (!cachesToKeep.includes(key)) {
            return caches.delete(key);
          }
        }),
      ),
    ),
  );
});

Specifications

Specification
Service Workers
# cache-storage-delete

Browser compatibility

BCD tables only load in the browser

See also