JS / 05.06.2023 / Alex


Picture this: a nifty note-taking app that, unfortunately, can only operate online. The beauty of a PWA is that it bridges this gap, bringing online functionality to offline use.

And how do we achieve this? The secret lies in the Workbox toolset, and I’m about to show you how to unlock its potential.

The Manifest File

Think of the manifest file as the PWA's DNA, outlining all the critical details about your app. This JSON file contains data about the app's appearance once installed, including name, description, start_url, display, and icons.

  "name": "OpenNote",
  "short_name": "OpenNote",
  "description": "An open-source, offline-capable note-taking application, designed to capture and share your ideas freely and efficiently, anytime, anywhere.",
  "start_url": "/",
  "display": "standalone",
  "icons": []


Who doesn't appreciate a visually appealing app? A well-designed icon can make your app stand out, and tools like Canva can help you create eye-catching visuals. Once you have your design, use online tools to generate a bundle with the appropriate sizes.

Ensuring Responsiveness

For your app to display correctly on notched devices, add

<meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover" />

to your index.html file. And to ensure your content remains visible and unobstructed by notches or home indicators, add safe area padding using a Tailwind plugin.

Service Workers

Service workers sit at the heart of any PWA, enabling offline functionality and enhancing the user experience. As a browser API, you can register service workers as follows.

They operate in their own thread and work with the browser Cache API. The key takeaway here is that service workers can make your application work offline.

self.addEventListener('install', (event) => {
    caches.open('my-cache').then((cache) => {
      return cache.addAll([

However, real-world applications use bundlers that hash and concatenate file names. This could lead to additional work of setting up a backend system for post-bundling. But there's an easier way.


Workbox is a Swiss Army knife for service workers. This set of tools from Google allows you to precache files with 'workbox-precaching', cache at runtime with 'StaleWhileRevalidate', and integrate with bundlers.

Reaping the Rewards

There you have it – your website is now a fully functioning PWA! With the right toolkit and these techniques at your fingertips, you can create seamless digital experiences for your users.

Remember, mastery is a journey, not a destination. Keep practicing, keep improving, and keep pushing the boundaries of what you can do with coding. Let's chase that 10k a month together.