[Solved] When using PUT to update a resource, what happens if some fields are missing in the request body? — Ans: The missing fields are deleted from the resource | Rest API

Rest API - HTTP Methods

When using PUT to update a resource, what happens if some fields are missing in the request body?

AThe missing fields are deleted from the resource

BThe missing fields remain unchanged

CThe server returns an error

DThe missing fields are set to null automatically

Step-by-Step Solution

Solution:

Step 1: Understand PUT replaces the entire resource
PUT expects the full resource representation, so missing fields are removed.
Step 2: Compare with PATCH behavior
PATCH updates only specified fields, leaving others intact.
Final Answer:
The missing fields are deleted from the resource -> Option A
Quick Check:
PUT missing fields = deleted [OK]

Quick Trick: PUT replaces whole resource; missing fields get removed [OK]

Common Mistakes:

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When using PUT to update a resource, what happens if some fields are missing in the request body?