What status code should a failed AJAX form post return?
PICTURE THIS: DJANGO MVT
Simple meaning
I often return 400 with HTML or JSON errors the client understands.
WHY — Ajax instead of guessing?
Why interviewers care about Ajax:
who only read docs from people who shipped.
and tied to .NET MVC work.
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 often return 400
with HTML or JSON errors the client understands.
- 2200 with an error
flag confuses instrumentation.
- 3How it works
Consistency across endpoints matters.
- 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 often return 400 with HTML or JSON errors the client understands. 200 with an error flag confuses instrumentation.