Progressive Web Apps (PWA) — Free App Development Tutorial

Learn Progressive Web Apps (PWA) in App Development with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Progressive Web Apps (PWA) in App Development with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Sep 17, 2026

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Progressive Web Apps (PWA) in App Development

A Progressive Web App (PWA) is a web app that uses modern web APIs to deliver app-like experiences on any device.

PWAs can be installed on a user's home screen, work offline, send push notifications, and load instantly.

A Service Worker is a JavaScript file that runs in the background, intercepting network requests and enabling offline caching.

The Web App Manifest is a JSON file that defines how the app looks when installed (name, icon, colors, display mode).

PWAs must be served over HTTPS and meet Lighthouse's installability criteria to be installable.

Progressive Web Apps (PWA) — Syntax

// Register a Service Worker
if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register('/sw.js')
    .then(() => console.log('SW registered'))
    .catch(console.error);
}

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