Persist State Easily with Hydrated Bloc in Flutter
Whether it’s a half-filled form, a shopping cart, or a paused game level. Losing state feels like losing progress. Handling it requires local state storing strategy.
State management is one of the most important considerations in Flutter development. While the bloc package is already a popular choice for predictable and testable state management, there’s one problem it doesn’t solve out of the box: state persistence
You need to decide:
Where to store the data? (SharedPreferences, Hive, SQLite, files…?)
How to serialize and deserialize your state?
When to save and restore it?
How to integrate it cleanly with your state management solution?
This takes time…
Enter hydrated_bloc
It is an extension to the bloc state management library in flutter.
If you already use the bloc or cubit state management pattern, hydrated_bloc is like adding an instant “memory” to your app.
Instead of manually wiring up storage logic, hydrated_bloc:
Automatically saves your bloc/cubit state to local storage.
Restores it automatically when the app restarts.
Requires almost zero boilerplate beyond converting your state to and from JSON.
Why This Matters for Mobile Apps
Mobile apps have unique challenges:
Apps get killed in the background to free memory.
Users switch devices or lose internet but still expect progress to remain.
Short attention spans mean users might not come back if they lose data.
The Benefits
Saves Development Time - Skip building a storage layer from scratch.
Better UX – Users resume exactly where they left off.
Seamless Integration – Works with both Bloc and Cubit patterns.
Minimal Boilerplate – Just toJson and fromJson methods.
Offline Friendly – Great for apps that need to work without constant connectivity.
When to Reach for hydrated_bloc
Perfect for:
Shopping carts
Multi-step forms
Game progress
Draft content
App settings
Not ideal for:
Massive datasets (use a database)
Highly sensitive data (stored unencrypted by default)
You can try it out here:
