The unregister() method of the ServiceWorkerRegistration interface unregisters the service worker registration and returns a Promise. The promise will resolve to false if no registration was found, otherwise it resolves to true irrespective of whether unregistration happened or not (it may not unregister if someone else just called ServiceWorkerContainer.register() with the same scope.) The service worker will finish any ongoing operations before it is unregistered.

None.

Promise resolves with a boolean indicating whether the service worker has unregistered or not.

The following simple example registers a service worker example, but then immediately unregisters it again:

if ("serviceWorker" in navigator) {
  navigator.serviceWorker
    .register("/sw.js", { scope: "/" })
    .then((registration) => {
      // registration worked
      console.log("Registration succeeded.");
      registration.unregister().then((boolean) => {
        // if boolean = true, unregister is successful
      });
    })
    .catch((error) => {
      // registration failed
      console.error(`Registration failed with ${error}`);
    });
}

• Using Service Workers
• Service workers basic code example
• Is ServiceWorker ready?
• Promise
• Using web workers