This project demonstrates how to implement centralized exception handling middleware in ASP.NET Core using .NET 8.0. It showcases the use of UseExceptionHandler() to intercept unhandled exceptions globally and map them to standardized API responses. The project includes a custom ValidationException type, a standardized ApiResponse record with Data and Error properties, and an IEndpointFilter implementation that wraps all endpoint results in a consistent response format.
The solution also demonstrates how to combine global exception handling with endpoint-level filtering for consistent API responses. FluentValidation is integrated for input validation, and Swagger/OpenAPI documentation is included via Swashbuckle. The project provides conditional debug information, including stack traces in DEBUG builds, while keeping production responses clean. This is a practical reference for building robust, production-ready ASP.NET Core APIs with proper error handling.
- .NET 8.0 SDK or later
cd ErrorMiddlewareExample
dotnet runIf you found this useful and you want to learn more about C#, .NET, and software engineering, subscribe to the free Dev Leader Weekly newsletter:
Subscribe to Dev Leader Weekly
- All Links
- Website - Dev Leader
- YouTube - Dev Leader
- YouTube - Dev Leader Path To Tech
- YouTube - Dev Leader Podcast
- YouTube - CodeCommute
- Newsletter - Dev Leader Weekly
- LinkedIn - Nick Cosentino
- GitHub - ncosentino
- Twitter/X - Dev Leader
- Threads - Dev Leader
- Bluesky - Dev Leader
- Mastodon - Dev Leader
- Facebook - Dev Leader
- TikTok - Dev Leader
- Twitch - Dev Leader
- Stack Overflow - Nick Cosentino
Powered by BrandGhost 👻