What is Swagger API?

Swagger (now known as the OpenAPI Initiative) is a set of open-source tools, specifications, and libraries that help design, build, document, and consume RESTful APIs. It provides a standard format to describe APIs, enabling both humans and computers to understand the capabilities of a service without requiring access to source code, documentation, or network traffic inspection. Swagger UI is a particularly popular component that generates an interactive API documentation website based on the Swagger/OpenAPI specification.