What is PWA, and how it works?

what is pwa

PWA stands for Progressive Web App. It is a term used to describe web applications that have a native app-like experience on a web browser.
PWAs are designed to work offline or on low-quality networks, load quickly, and be easily discoverable and installable through a web browser.

The main goal of PWAs is to provide users with a seamless and fast experience that is similar to that of a native app, but without the need to download an app from an app store.

PWAs use modern web technologies such as Service Workers, Web App Manifest, and Web APIs to provide this native-like experience on the web.

What is Service worker ?

Service Workers are registered by your web app and run in a separate thread, separate from the main JavaScript that runs in your web app.

This allows them to continue running even when the user has closed the web app or navigated to another site.

A Service Worker is a script that runs in the background of a Progressive Web App (PWA) and acts as a proxy between your web app and the network.

It enables features such as offline access, background sync, and push notifications, which are not possible with traditional web apps.

Example of PWA ?

  1. Twitter Lite: Twitter’s lightweight PWA provides a fast and reliable experience for users, even on slow networks.
  2. Forbes: The Forbes PWA offers an immersive reading experience for users, with articles that load quickly and can be read offline.
  3. AliExpress: The AliExpress PWA offers a fast and responsive shopping experience for users, with features such as push notifications and offline access to shopping carts.
  4. Lyft: The Lyft PWA provides a native-like experience for users, including access to ride booking, driver tracking, and payment processing, all within a web browser.
  5. Trivago: The Trivago PWA offers a fast and seamless experience for users searching for travel deals, with features such as offline access to search results and quick loading times.

Convert a website to PWA:

  1. Create a web app manifest: This is a JSON file that defines the appearance and behavior of your PWA when it is launched from the home screen or app launcher.
  2. The manifest should include information such as the name, icons, start URL, and display mode.
  3. Implement Service Workers: Service Workers are scripts that run in the background and enable features such as offline access, background sync, and push notifications.
  4. To implement Service Workers, you need to register a script file in your HTML file and write the logic for your Service Worker in JavaScript.
  5. Make sure your site is served over HTTPS: This is a requirement for Service Workers to work, and it also enhances the security of your PWA.
  6. Optimize for performance: PWAs should be fast and responsive, so it’s important to optimize your HTML file for performance, including reducing the size of assets, using lazy-loading, and implementing code splitting.
  7. Add a “Add to Home Screen” prompt: You can use JavaScript to prompt the user to add the PWA to their home screen, making it easier to launch in the future.
  8. Test and validate your PWA: Use tools such as Lighthouse and the PWA Checklist to validate that your PWA meets all the necessary criteria and provides a great user experience.
  9. Deploy: Finally, deploy your PWA to a web server and make sure it’s accessible to users.
<!DOCTYPE html>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="manifest" href="manifest.json">
    <link rel="icon" type="image/png" href="icon.png">
    <!-- Your HTML content here -->

    <!-- Register the Service Worker -->
      if ('serviceWorker' in navigator) {
        window.addEventListener('load', function() {
          navigator.serviceWorker.register('/service-worker.js').then(function(registration) {
            console.log('Service Worker registered:', registration);
          }).catch(function(error) {
            console.error('Service Worker registration failed:', error);

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