When building custom form collections for employee onboarding, form parameters support the following data types:

Type	Description
boolean	Represents a parameter that accepts boolean values (true/false). Typically rendered as Yes/No select options in the UI.
currency	Represents a parameter that accepts currency values with up to 2 decimal places. Used for dollar amounts like additional withholding amounts.
number	Represents a parameter that accepts positive integer values. Used for whole number inputs like number of dependents or allowances.
percent	Represents a parameter that accepts positive decimal values ranging from 0 to 100. Used for percentage inputs like withholding percentages.
select	Represents a parameter that accepts values from a predefined list of options. Each option has a `value` and human-readable `label` property. The `options` field will be populated with the available choices.
string	Represents a parameter that accepts any text string. Used for text inputs like names, addresses, SSN, and other free-form text fields.

Usage Example

When retrieving a form via GET /forms/:form_id, each parameter in the response will include a type field indicating which of these types it expects:

{
  "parameters": [
    {
      "name": "additional_withholding",
      "label": "Additional amount to withhold",
      "type": "currency",
      "required": false
    },
    {
      "name": "filing_status",
      "label": "Filing status",
      "type": "select",
      "options": [
        {"value": "single", "label": "Single"},
        {"value": "married", "label": "Married"}
      ],
      "required": true
    },
    {
      "name": "allowances",
      "label": "Number of allowances",
      "type": "number",
      "required": true
    },
    {
      "name": "exempt",
      "label": "Exempt from withholding",
      "type": "boolean",
      "required": false
    },
    {
      "name": "withholding_percentage",
      "label": "Additional withholding percentage",
      "type": "percent",
      "required": false
    },
    {
      "name": "employee_signature",
      "label": "Employee signature",
      "type": "string",
      "required": true
    }
  ]
}

Validation

Each parameter type has specific validation rules:

boolean: Must be either "true" or "false" as strings
currency: Numeric value with up to 2 decimal places (e.g., "123.45")
number: Positive integer values only (e.g., "5")
percent: Decimal value between 0 and 100 (e.g., "15.5")
select: Value must match one of the provided option values
string: Any text string, subject to field-specific validation (e.g., SSN format)

When submitting form data, ensure values are provided as strings matching the expected format for each type.