[Solved] A response mapping template uses this code:{ "result": "$input.path('$.data.result')", "error": "$input.path('$.errorMessage')" }The backend sometimes returns no errorMessage field.... | AWS

AWS - API Gateway

A response mapping template uses this code:

{
  "result": "$input.path('$.data.result')",
  "error": "$input.path('$.errorMessage')"
}

The backend sometimes returns no errorMessage field. What issue might occur?

AThe client will receive an error HTTP status

BThe mapping template will cause a syntax error

CThe entire response will fail to map

DThe error field will be null or empty in the response

Step-by-Step Solution

Solution:

Step 1: Understand missing fields in mapping
If errorMessage is missing, $input.path returns null or empty string for "error".
Step 2: Effect on response
The response still succeeds but the "error" field is null or empty, not causing failure.
Final Answer:
The error field will be null or empty in the response -> Option D
Quick Check:
Missing fields map to null, no syntax error [OK]

Quick Trick: Missing JSON fields map to null, not errors [OK]

Common Mistakes:

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A response mapping template uses this code: