04 · Advanced

Use explicit mapping rules when the transformation needs more control.

For nested structures, the mapping can describe the same hierarchy as the input. This keeps the transformation predictable and readable.

{
  "customer": {
    "first_name": "name",
    "address": {
      "zip_code": "postal_code"
    }
  }
}

Keep the mapping focused on naming. Shape normalization and value conversion are separate concerns.