[Solved] You want to create a request mapping template that extracts userId and roles from a nested JSON request:{ "user": { "id": "u123", "details": { "roles":... | AWS

AWS - API Gateway

You want to create a request mapping template that extracts userId and roles from a nested JSON request:

{
  "user": {
    "id": "u123",
    "details": {
      "roles": ["admin", "editor"]
    }
  }
}

Which mapping template correctly extracts userId as a string and roles as a JSON array?

A{ "userId": "$input.path('$.user.id')", "roles": $input.path('$.user.details.roles') }

B{ "userId": "$input.path('$.user.id')", "roles": "$input.path('$.user.details.roles')" }

C{ "userId": $input.path('$.user.id'), "roles": $input.path('$.user.details.roles') }

D{ "userId": "$input.json('$.user.id')", "roles": $input.json('$.user.details.roles') }

Step-by-Step Solution

Solution:

Step 1: Extract userId as string
Use quotes around $input.path for userId to get string value.
Step 2: Extract roles as JSON array
Do not quote roles extraction to keep it as JSON array, so $input.path without quotes.
Step 3: Evaluate options
{\n "userId": "$input.path('$.user.id')",\n "roles": $input.path('$.user.details.roles')\n} correctly quotes userId and leaves roles unquoted. Quoting roles makes it a stringified array. Omitting quotes for userId produces invalid JSON. $input.json is invalid syntax.
Final Answer:
{\n "userId": "$input.path('$.user.id')",\n "roles": $input.path('$.user.details.roles')\n} -> Option A
Quick Check:
Quote strings, leave JSON arrays unquoted [OK]

Quick Trick: Quote strings, leave JSON arrays unquoted in templates [OK]

Common Mistakes:

MISTAKES

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