Can you explain what the Swagger tool is and how it is used in API development?

Swagger is a set of tools and a specification for describing, creating, documenting, and testing RESTful APIs. The main idea is to describe the API in the OpenAPI Specification (formerly Swagger Specification), which is machine-readable.

How Swagger is used in API development:

• It allows automatic generation of API documentation, which is convenient for developers.
• Client code can be generated in various languages based on the API specification.
• It helps test the API through an interactive interface (Swagger UI).
• It simplifies communication between backend and frontend teams.

Example: a developer describes the API in a swagger.yaml file, then uses Swagger UI to view and test all endpoints.

In C#, the Swashbuckle package is often used, which automatically generates Swagger documentation from ASP.NET Core controller code.