A sustainable API comes from creating a solid foundational design. To achieve this goal, a developer must use best practices along with the right tools. In this course, you'll learn strategies for designing reusable API web services as well as methods for determining the API's maturity level. Next, you'll explore the tools available with Swagger, including the API editor, the API code and client generator, the REST API documentation tool, and the REST API testing tool. Finally, you'll learn about methods and tools for designing REST APIs such as Swagger, OpenAPI, and YAML.