How should a REST API handle validation errors for a list of items, for example, errors in each element of a 'products' array?

hard📝 Application Q9 of 15

Rest API - Error Handling

A{"errors": {"products": "Invalid list"}}

B{"errors": {"products": {"0": {"name": "Required"}, "1": {"price": "Must be positive"}}}}

C{"errors": {"products": ["Error in list"]}}

D{"errors": {"products": {"name": "Required", "price": "Must be positive"}}}

Step-by-Step Solution

Solution:

Step 1: Understand error reporting for list elements
Each list element can have its own errors, so errors should be keyed by index.
Step 2: Identify correct JSON structure
{"errors": {"products": {"0": {"name": "Required"}, "1": {"price": "Must be positive"}}}} uses numeric keys for each product index with nested field errors.
Final Answer:
{"errors": {"products": {"0": {"name": "Required"}, "1": {"price": "Must be positive"}}}} -> Option B
Quick Check:
List errors keyed by index with nested field errors [OK]

Quick Trick: Use indexes as keys for list item errors [OK]

Common Mistakes:

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