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The official Dart client for Stream Chat, a service for building chat applications.

Official Dart Client for Stream Chat #

The official Dart client for Stream Chat, a service for building chat applications. This library can be used on any Dart project and on both mobile and web apps with Flutter.

Pub CI

Quick Links

V4 Migration Guide

For upgrading from V3 to V4, please refer to the V4 Migration Guide

Changelog #

Check out the changelog on to see the latest changes in the package.

Getting started #

Add dependency #

Add this to your package's pubspec.yaml file, use the latest version Pub

 stream_chat: ^latest-version

You should then run flutter packages get

Example Project #

There is a detailed Flutter example project in the example folder. You can directly run and play on it.

Setup API Client #

First you need to instantiate a chat client. The Chat client will manage API call, event handling and manage the web socket connection to Stream Chat servers. You should only create the client once and re-use it across your application.

final client = StreamChatClient("stream-chat-api-key");

Logging #

By default the Chat Client will write all messages with level Warn or Error to stdout.

Change Logging Level

During development you might want to enable more logging information, you can change the default log level when constructing the client.

final client = StreamChatClient("stream-chat-api-key", logLevel: Level.INFO);

Custom Logger

You can handle the log messages directly instead of have them written to stdout, this is very convenient if you use an error tracking tool or if you want to centralize your logs into one facility.

myLogHandlerFunction = (LogRecord record) {
  // do something with the record (ie. send it to Sentry or Fabric)

final client = StreamChatClient("stream-chat-api-key", logHandlerFunction: myLogHandlerFunction);

Offline storage #

To add data persistence, you can extend the class ChatPersistenceClient and pass an instance to the StreamChatClient.

class CustomChatPersistentClient extends ChatPersistenceClient {

final client = StreamChatClient(
  apiKey ?? kDefaultStreamApiKey,
  logLevel: Level.INFO,
)..chatPersistenceClient = CustomChatPersistentClient();

We provide an official persistent client in the stream_chat_persistence package.

import 'package:stream_chat_persistence/stream_chat_persistence.dart';

final chatPersistentClient = StreamChatPersistenceClient(
  logLevel: Level.INFO,
  connectionMode: ConnectionMode.background,

final client = StreamChatClient(
  apiKey ?? kDefaultStreamApiKey,
  logLevel: Level.INFO,
)..chatPersistenceClient = chatPersistentClient;

Contributing #

Code conventions #

  • Make sure that you run dartfmt before you commit your code
  • Make sure all public methods and functions are well documented

Running tests #

  • run flutter test

Releasing a new version #

  • update the package version on pubspec.yaml and version.dart

  • add a changelog entry on

  • run flutter pub publish to publish the package

Watch models and generate JSON code #

JSON serialization relies on code generation; make sure to keep that running while you make changes to the library

flutter pub run build_runner watch