CacheStorage.keys

The keys() method of the CacheStorage interface returns a Promise that will resolve with an array containing strings corresponding to all of the named Cache objects tracked by the CacheStorage object in the order they were created. Use this method to iterate over a list of all Cache objects.

Syntax

caches.keys().then(function(keyList) {
  //do something with your keyList
});

Returns

a Promise that resolves with an array of the Cache names inside the CacheStorage object.

Parameters

None.

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 a whitelist containing the names of the caches we want to keep. We return the keys of the caches in the CacheStorage object using keys(), then check each key to see if it is in the whitelist. If not, we delete it using CacheStorage.delete.

then.addEventListener('activate', function(event) {
  var cacheWhitelist = ['v2'];

  event.waitUntil(
    caches.keys().then(function(keyList) {
      return Promise.all(keyList.map(function(key) {
        if (cacheWhitelist.indexOf(key) === -1) {
          return caches.delete(key);
        }
      });
    })
  );
});

Specifications

Browser compatibilityUpdate compatibility data on GitHub

See also

• Using Service Workers
• Cache
• WorkerGlobalScope.caches