Build a Next.js 16 PWA that actually works offline. Learn how to cache the app shell, store data locally with IndexedDB, and sync changes when connectivity returns.

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Progressive Web Apps often fail to deliver true offline functionality beyond basic caching. This guide demonstrates building a Next.js 16 PWA with genuine offline support using Serwist for service worker management, IndexedDB for local data storage, and automatic background sync. The tutorial walks through creating an offline-capable todo app that allows users to add, edit, and delete tasks without connectivity, then automatically syncs changes when the network returns. Key implementation details include configuring Serwist with Webpack (since Turbopack isn't compatible), setting up IndexedDB schemas with the idb library, implementing sync logic with online/offline detection, and handling the app shell model versus true offline functionality. The approach extends beyond static asset caching to enable full CRUD operations while disconnected.

Build a Next.js 16 PWA with true offline support

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