How to handle Domain Validation/Exceptions?

[utkugenel]

Example is not a real case, just to ask my question.

Error Response 1: ( fast-endpoints & Fluent validation)
{ "statusCode": 400, "message": "One or more errors occurred!", "errors": { "username": [ "The length of 'Username' must be at least 2 characters. You entered 1 characters." ] } }

Error Response 2: (Argument Exception thrown from domain entity with extended ardalis GuardClauses)
{ "status": "Internal Server Error!", "code": 500, "reason": "Invalid username! Max length:15. Can only contain letters, numbers, hyphens (-) and underscores (_)", "note": "See application log for stack trace." }

Two different error response here. I want error messages in the same format.
What is best way to handle exceptions on domain?

[utkugenel]

I found my answer.
We can customize fast-endpoints's exception handler.
https://fast-endpoints.com/docs/exception-handler#customizing-the-exception-handler

[ardalis]

See also:

https://youtu.be/dpPcnAT7n7M?si=Fy9sQUL8bALO6OZ6