How do you return ProblemDetails from an API?
PICTURE THIS: HOW TO EXPLAIN IT
Simple meaning
I use Results.Problem or validation ProblemDetails for consistent error JSON.
WHY — ASP.NET instead of guessing?
Why interviewers care about ASP.NET:
question about ASP.NET.
trade-offs, and what you would actually do on a .NET project - not buzzwords.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1I use Results.Problem or
validation ProblemDetails for consistent error JSON.
- 2Clients get type, title,
status, and errors.
- 3How it works
It beats ad-hoc error strings.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
I use Results.Problem or validation ProblemDetails for consistent error JSON. Clients get type, title, status, and errors.