Looking for best practices on building RESTful APIs? This book is for you! Why? Because this book is packed with best practices on many technical aspects of RESTful API Design, such as the correct use of resources, URIs, representations, content types, data formats, parameters, HTTP status codes and HTTP methods. You want to design and develop APIs like a Pro? Use API description languages to both design APIs and develop APIs efficiently. The book introduces the two most common API description languages RAML and OpenAPI/Swagger.Your APIs connect to legacy systems? The book shows best practices for connecting APIs to existing backend systems.You expect lots of traffic on your API? The book shows you how to achieve high security, performance, availability and smooth evolution and versioning.Your company cares about its customers? Learn a customer-centric design and development approach for APIs, so you can design APIs as digital products. The API-University Series is a modular series of books on API-related topics. Each book focuses on a particular API topic, so you can select the topics within APIs, which are relevant for you.