How to clear cache of service worker?

Solution 1:

If you know the cache name you can simply call caches.delete() from anywhere you like in the worker:

caches.delete(/*name*/);

And if you wanted to wipe all caches (and not wait for them, say this is a background task) you only need to add this:

caches.keys().then(function(names) {
    for (let name of names)
        caches.delete(name);
});

Solution 2:

Use this to delete outdated caches:

self.addEventListener('activate', function(event) {
  event.waitUntil(
    caches.keys().then(function(cacheNames) {
      return Promise.all(
        cacheNames.filter(function(cacheName) {
          // Return true if you want to remove this cache,
          // but remember that caches are shared across
          // the whole origin
        }).map(function(cacheName) {
          return caches.delete(cacheName);
        })
      );
    })
  );
});

Solution 3:

Typically you update the CACHE_NAME in your service workers JS file so your worker installs again:

self.addEventListener('install', evt => {
  evt.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(inputs))
  )
})

Alternatively, to clear the cache for a PWA find the cache name:

self.caches.keys().then(keys => { keys.forEach(key => console.log(key)) })

then run the following to delete it:

self.caches.delete('my-site-cache')

Then refresh the page.

If you see any worker-related errors in the console after refreshing, you may also need to unregister the registered workers:

navigator.serviceWorker.getRegistrations()
  .then(registrations => {
    registrations.forEach(registration => {
      registration.unregister()
    }) 
  })