How do you generate API documentation automatically from your codebase?

Short answer: In ASP.NET Core: Use Swashbuckle package to generate Swagger UI from controllers and annotations.

Explain a bit more

services.AddSwaggerGen(c => { c.SwaggerDoc("v1", new OpenApiInfo { Title = "My API", Version = "v1" }); }); app.UseSwagger(); app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API v1")); Other frameworks (Node.js: swagger-jsdoc, Spring Boot: springdoc-openapi) also support annotations and automatic documentation.

Real-world example (ShopNest)

ShopNest exposes REST APIs for cart and checkout. Controllers stay thin; business rules live in application services.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.