An application programming interface (API) enables data exchange in systems such as web applications, microservices, and IoT devices. In this hands-on book, authors Lukasz Dynowski and Marcin Dulak show software developers and architects how to design and implement REST, GraphQL, gRPC, webhooks, WebSocket, messaging APIs, and more. This book looks at the most popular API styles from a network, application, and architecture perspective. Youll learn how to determine the appropriate type of API for your application use case and how to tackle design decisions along the way. Youll also learn the trade-offs between various APIs and acquire practical knowledge of how to implement them. Explore the origins and evolution of API styles Learn network protocols that various APIs use Understand the trade-offs of each API style Select an appropriate API style Learn how to implement, secure, and document the APIs