Answer piping

Answer piping inserts a field’s answer into form text, labels, and redirect URLs. Use it to personalize questions or show a respondent’s answers later in the form.

Syntax

Write a field name between double curly braces: {{field_name}}. Names can contain letters, digits, and underscores.

The value comes from the field’s answer. If there is no answer, piping uses the hidden field with that name; if neither has a value, it inserts an empty string. Array answers appear as comma-separated values. Calculation answers appear as formatted numbers.

In the editor preview, variables appear as written.

Where you can use variables

Form property	Supported locations
Fields	`label`, `subtext`, `input_label`, `placeholder`
Text blocks	`copy` on `text`, `h1`, `h2`, and `h3` blocks
Divider	`copy`
Add to calendar	`title`, `location`, and `details`
Result breakdown	Questions
End page	`redirect_url`

Notification email templates use different variables: {{formName}} and {{field.<name>}}.

Example: personalize text with answers

This config inserts the respondent’s name into a text block and their selected topics into a later block. Array answers are shown as comma-separated values.

{
  "mode": "page",
  "pages": [
    {
      "type": "form",
      "id": "p1",
      "ui": [
        {
          "type": "short_text_input",
          "name": "first_name",
          "label": "What should we call you?",
          "required": true
        },
        {
          "type": "checkboxes",
          "name": "topics",
          "label": "Which topics interest you?",
          "options": ["Design", "Research", "Engineering"]
        }
      ]
    },
    {
      "type": "form",
      "id": "p2",
      "ui": [
        {
          "type": "text",
          "copy": "Thanks, {{first_name}}. You selected: {{topics}}."
        }
      ]
    }
  ],
  "end": [
    {
      "id": "e0",
      "type": "end",
      "ui": [
        {
          "type": "text",
          "copy": "Thanks for sharing your interests, {{first_name}}."
        }
      ]
    }
  ]
}

Example: use an answer in a redirect URL

An end page can insert an answer into redirect_url. The value is URL-encoded. This example sends the respondent’s email address as a query parameter.

{
  "mode": "page",
  "pages": [
    {
      "type": "form",
      "id": "p1",
      "ui": [
        {
          "type": "email_input",
          "name": "email",
          "label": "What is your email address?",
          "required": true
        }
      ]
    }
  ],
  "end": [
    {
      "id": "e0",
      "type": "end",
      "variant": "redirect",
      "redirect_url": "https://example.com/thanks?email={{email}}",
      "redirect_delay": 3,
      "ui": []
    }
  ]
}

You can also pipe hidden-field values. Hidden fields are declared in form settings, separately from the form config. A hidden-field value is used when there is no answer for a field with that name. Arrays in redirect URLs are joined with commas; objects become empty.