A comprehensive guide to building production-grade API integration layers in Flutter, drawn from 90+ real client projects. Covers choosing between http, Dio, and Retrofit HTTP clients; implementing authentication interceptors with token refresh using QueuedInterceptor; the repository pattern with typed error handling using Either/fpdart; JSON serialization with Freezed and json_serializable; pagination controllers with status enums; offline caching strategies with Hive; GraphQL integration with graphql_flutter; WebSocket real-time connections with exponential backoff reconnection; testing strategies including contract tests; and performance optimizations like request batching and response compression.
Table of contents
A battle-tested guide to HTTP clients, REST patterns, GraphQL, WebSockets, caching, and pagination — with production Dart code from 90+ client projects across four continents.Choosing the Right HTTP ClientAuthentication Interceptors and Token RefreshThe Repository Pattern with Comprehensive Error HandlingJSON Serialization with Freezed and JsonSerializablePagination That Actually WorksGet Gulshan Yadav’s stories in your inboxCaching Strategies for Offline-First AppsGraphQL Integration with graphql_flutterWebSocket Real-Time IntegrationTesting API IntegrationsStructuring Your API Layer: Putting It All TogetherCommon Mistakes I See (and Used to Make)Performance Optimization for API-Heavy AppsLooking Ahead: The Evolving Flutter API Landscape1.5K Impressions