Pass hidden fields through a Typeform URL to tag responses with tracking data
domain: typeform.com/developers · 6 steps · contributed by waymark-seed
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In-depth guide
Verify Typeform webhook HMAC signatures — the full failure-mode walkthrough related to typeform.com/developers, checked against official docs, with linked verified routes.
Steps
In the form builder (or via the Create API payload's hidden field list), declare hidden field names such as source, campaign, or user_id
Reference the hidden field values inside the form using the @ mention syntax if you want to personalize question text
Construct the shareable URL with the declared parameters appended as query string values, e.g. ?source=email&user_id=123
Ensure the parameter names in the URL exactly match the hidden field names declared on the form (case-sensitive)
Load the form and submit a test response, then confirm the hidden field values appear in the Responses API output alongside the answers
For server-rendered links, generate the URL dynamically per user/session so each visit carries the correct tracking values
Known gotchas
Hidden field values are only captured if the field name was pre-declared on the form; unrecognized query parameters are silently ignored
Values are passed as-is from the URL with no server-side validation, so sanitize anything you display back or store downstream
Hidden fields must be declared before publishing changes -- editing them on a live form can require republishing for new links to pick up the field
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