Category: ASP.NET

Validate DTOs with annotations/FluentValidation.

Catch domain exceptions and map to proper status codes.

Centralize errors with middleware or IExceptionHandler.

Separate request DTOs from response shapes.

Use Data Transfer Objects at the API boundary.

Configure System.Text.Json naming and null handling.

Persist API data with EF Core DbContext.

Wire connection strings, migrations, and health checks.

Use [Route], [HttpGet], and constraint templates.

Apply partial updates with JSON Patch or patch DTOs.