Implementing offline sync in your PWA
GuideDecember 29, 2025•1 min read•By PWASK Team
Queue mutations, retry on reconnect, resolve conflicts, and keep the UI responsive with optimistic updates.
Offline sync is the core of a reliable PWA. PWASK queues writes, retries on reconnect, and applies optimistic UI updates.
Pattern
- Detect offline and queue operations with IDs.
- Persist queue in IndexedDB.
- Retry with backoff; de-duplicate server-side.
- Resolve conflicts via timestamps or custom merge rules.
Tips
- Keep payloads small; compress images.
- Provide user feedback (queued, syncing, done).
- Log sync events for debugging.
Start simple with last-write-wins; upgrade to merges where needed.