What do HTTP status codes 200, 401, and 404 mean for the UI?
PICTURE THIS: 1, 2, 2, 8
Simple meaning
200 means success so I render the data.
WHY — Browser instead of guessing?
Why interviewers care about Browser:
who only read docs from people who shipped.
and tied to Frontend 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:
- 1200 means success so
I render the data.
- 2401 means unauthenticated, so
I send the user to login.
- 3404 means the resource
is missing, so I show a not-found state instead of a generic spinner forever.
- 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
200 means success so I render the data. 401 means unauthenticated, so I send the user to login.