Offline-First Application Architecture with Dexie.js

Do you want your users to access and interact with your web application even during sudden network disconnections? An Offline-First architecture achieves this by storing data locally in the browser database (IndexedDB) first, and then synchronizing with cloud servers when network connectivity is available. We implemented this in our Polyvo application.

Simplifying IndexedDB with Dexie.js

IndexedDB offers a low-level, complex transactional database API. Dexie.js wraps IndexedDB into a modern, Promise-based abstraction that makes handling index schemas, structured queries, and write transactions straightforward and efficient.

Synchronization Logic

All writes in offline mode (such as saving study decks or progress) are written to local stores. When internet connectivity is restored, background workers detect the state and push updates to Firebase Firestore, utilizing transaction logs and timestamps to resolve merge conflicts safely.