• service-worker.js

  • function getEndpoint() {
      return self.registration.pushManager.getSubscription()
      .then(function(subscription) {
        if (subscription) {
          return subscription.endpoint;
        throw new Error('User not subscribed');
  • Register event listener for the ‘push’ event.

    self.addEventListener('push', function(event) {
  • Keep the service worker alive until the notification is created.

        .then(function(endpoint) {
  • Retrieve the textual payload from the server using a GET request. We are using the endpoint as an unique ID of the user for simplicity.

          return fetch('./getPayload?endpoint=' + endpoint);
        .then(function(response) {
          return response.text();
        .then(function(payload) {
  • Show a notification with title ‘ServiceWorker Cookbook’ and use the payload as the body.

          self.registration.showNotification('ServiceWorker Cookbook', {
            body: payload,

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