How do PUT, PATCH, and DELETE differ on a resource?
PICTURE THIS: HOW TO EXPLAIN IT
Simple meaning
PUT replaces the whole resource at that URL and is idempotent.
WHY — REST instead of guessing?
Why interviewers care about REST:
question about REST.
trade-offs, and what you would actually do on a Backend 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:
- 1PUT replaces the whole
resource at that URL and is idempotent.
- 2Why it exists
PATCH applies a partial update
- 3whether it is idempotent
depends on how you design the patch.
- 4Give an example
DELETE removes the resource
- 5repeating DELETE on a
missing id is often treated as success for idempotency.
- 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
PUT replaces the whole resource at that URL and is idempotent. PATCH applies a partial update