Using Push in Javascript: A Complete Guide

Have you ever seen a notification on your phone or computer that prompts you to take action? That’s called a push notification, and you can use it in your JavaScript applications to enhance user engagement. In this complete guide, we’ll dive into the world of push notifications in JavaScript. From understanding what push notifications are to implementing them in your code, we’ll cover everything you need to know.

Let’s begin by exploring what push notifications are and how they work.

What are Push Notifications?

Push notifications are messages that are sent to a user’s device through an application or website. These messages can be delivered even when the user is not actively using the application or website. They typically appear as pop-ups or banners and contain information, such as a message, image, or video.

Push notifications can be triggered by a variety of events, such as receiving a new message, a new post being uploaded, or a sale being made. They allow you to keep users engaged with your application or website even when they’re not actively using it.

How do Push Notifications Work?

Push notifications work by using a service worker, which is a script that runs in the background of your application or website. The service worker is responsible for handling push notifications and sending them to the user’s device.

When a user subscribes to push notifications, their device sends a subscription request to your server. Your server then sends a unique endpoint to the user’s device, which is used to send push notifications to the user.

When an event occurs that triggers a push notification, your server sends a message to the user’s endpoint. The message is then delivered to the user’s device, and the service worker handles displaying the notification to the user.

Setting Up Push Notifications

Before you can start sending push notifications, you’ll need to set up a few things. First, you’ll need to create a manifest file for your application. This file contains information about your application, such as its name, icons, and description.

Next, you’ll need to create a service worker that handles push notifications. This script should be registered with your application and should be able to handle push events.

Finally, you’ll need to subscribe the user to push notifications. This is typically done through a button or prompt that asks the user if they want to receive push notifications.

Subscribing to Push Notifications

To subscribe a user to push notifications, you’ll need to use the PushManager API. This API is available in most modern browsers and allows you to subscribe the user to push notifications.

Here’s an example of how to subscribe a user to push notifications:

  .then(registration => {
    return registration.pushManager.subscribe({
      userVisibleOnly: true,
      applicationServerKey: 'your-public-key-here'
  .then(subscription => {
    console.log('Subscription successful:', subscription);
  .catch(error => {
    console.error('Subscription error:', error);

In this example, we first register our service worker. We then call the pushManager.subscribe method, which prompts the user to allow push notifications. If the user allows push notifications, the subscription is successful, and we log the subscription to the console.

Handling Push Notifications

Once the user is subscribed to push notifications, you’ll need to handle push events in your service worker. Here’s an example of how to handle push events:

self.addEventListener('push', event => {
  const data =;
  const title = data.title;
  const options = {
    body: data.body,
    icon: 'icon.png'
  event.waitUntil(self.registration.showNotification(title, options));

In this example, we add an event listener to the service worker for the push event. When a push event is received, we extract the data from the event and display a notification to the user.


Push notifications can be a powerful tool for enhancing user engagement in your JavaScript applications. By understanding what push notifications are and how they work, you can start implementing them in your code and keep users engaged with your application or website.

In this complete guide, we covered everything you need to know about push notifications in JavaScript. From setting up push notifications to handling push events, we’ve provided detailed examples and explanations to help you succeed. So what are you waiting for? Start implementing push notifications in your code today and take your application to the next level!

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