# Official Chat Persistence Client for [Stream Chat](https://getstream.io/chat/)
> The official Chat Persistence Client for Stream Chat, a service for
> building chat applications.
[](https://pub.dartlang.org/packages/stream_chat_persistence)
**Quick Links**
- [Register](https://getstream.io/chat/trial/) to get an API key for Stream Chat
- [Flutter Chat Tutorial](https://getstream.io/chat/flutter/tutorial/)
- [Chat UI Kit](https://getstream.io/chat/ui-kit/)
- [Flutter Offline Docs](https://getstream.io/chat/docs/flutter-dart/flutter_offline/)
This package provides a persistence client for fetching and saving chat data locally.
Stream Chat Persistence uses [Moor](https://github.com/simolus3/moor) as a disk cache.
### Changelog
Check out the [changelog on pub.dev](https://pub.dev/packages/stream_chat_persistence/changelog) to see the latest changes in the package.
## Add dependency
Add this to your package's pubspec.yaml file, use the latest version [](https://pub.dartlang.org/packages/stream_chat_persistence)
```yaml
dependencies:
stream_chat_persistence: ^latest_version
```
You should then run `flutter packages get`
## Usage
The usage is pretty simple.
1. Create a new instance of StreamChatPersistenceClient providing `logLevel` and `connectionMode`.
```dart
final chatPersistentClient = StreamChatPersistenceClient(
logLevel: Level.INFO,
connectionMode: ConnectionMode.regular,
);
```
2. Pass the instance to the official Stream chat client.
```dart
final client = StreamChatClient(
apiKey ?? kDefaultStreamApiKey,
logLevel: Level.INFO,
)..chatPersistenceClient = chatPersistentClient;
```
And you are ready to go...
## Flutter Web
Due to Moor web (for offline storage) you need to include the sql.js library:
```html
```
You can grab the latest version of sql-wasm.js and sql-wasm.wasm [here](https://github.com/sql-js/sql.js/releases) and copy them into your `/web` folder.
## Contributing
We welcome code changes that improve this library or fix a problem,
please make sure to follow all best practices and add tests if applicable before submitting a Pull Request on Github.
We are pleased to merge your code into the official repository.
Make sure to sign our [Contributor License Agreement (CLA)](https://docs.google.com/forms/d/e/1FAIpQLScFKsKkAJI7mhCr7K9rEIOpqIDThrWxuvxnwUq2XkHyG154vQ/viewform) first.
See our license file for more details.