The fieldsToApi method transforms data from your fieldsSchema format into the format required by the external API. This method is called automatically before sending data in create or update operations.

Implementation Examples

Mapping Implementation (Recommended)

File: fields-to-api.map.yml

email_address: { $var: fields.email }
first_name: { $var: fields.firstName }
last_name: { $var: fields.lastName }
contact_id: |
  {
    $cond: [
      { $var: fields.id },
      { $var: fields.id },
      null
    ]
  }
custom_fields: |
  {
    $cond: [
      { $and: [
        { $var: parameters.includeCustomFields },
        { $var: fields.customData }
      ]},
      { $var: fields.customData },
      null
    ]
  }

JavaScript Implementation

File: fields-to-api.js

export default async function fieldsToApi({ fields, parameters }) {
  // Transform fieldsSchema to API format
  const apiFields = {
    email_address: fields.email,
    first_name: fields.firstName,
    last_name: fields.lastName,
  }

  // Only include ID for updates, not creates
  if (fields.id) {
    apiFields.contact_id = fields.id
  }

  // Add custom field mapping if enabled
  if (parameters?.includeCustomFields && fields.customData) {
    apiFields.custom_fields = fields.customData
  }

  return apiFields
}

Input

Property	Type	Description
`fields`	object	Fields in your fieldsSchema format
`parameters`	object	Collection parameters passed

Return Value

The method should return an object in the format expected by the external API.

Example

// Your fields:
{
  "id": "123",
  "email": "john@example.com",
  "firstName": "John",
  "lastName": "Doe",
  "fullName": "John Doe"
}

// fieldsToApi transforms to:
{
  "contact_id": "123",
  "email_address": "john@example.com",
  "first_name": "John",
  "last_name": "Doe"
}