Documenting ASP.NET Core Web API with Swagger, OpenAPI, and XML Comments

In this video, we fully implement professional documentation for an ASP.NET Core Web API using the OpenAPI Specification (OAS), Swagger UI customization, and XML Comments.

We use the Swashbuckle.AspNetCore package to automatically generate API documentation that is useful for both developers and users without exposing the backend source code!

✅ Installing and configuring Swashbuckle
✅ Adding XML comments for automatic endpoint documentation
✅ Setting up static files and customizing Swagger UI with new themes and logos
✅ Improving API usability with styled UI and favicon updates
✅ Using Dependency Injection for documentation setup
✅ Enabling documentation only for Development environment

This tutorial shows how to bring your API to a professional level — including real-world touches like personalized Swagger themes, Deakin University branding, and clean auto-generated documentation.