Understand hidden fields
Hidden fields attach context supplied through a form link. They do not hide information securely or prove a respondent’s identity.
Select a screenshot to enlarge it.
Steps
- Choose the context you need, such as a campaign source or a non-sensitive product reference.
- In Design → Logic → Customize using data → Hidden Fields, add a distinct field name and save it.
In Design, open Logic → Customize using data to find Hidden Fields and Variables. Definitions identify the fields expected in the respondent URL. Supply harmless URL-encoded values when testing. - Add that field as a query parameter to a copy of the respondent link, preserving the link’s existing parameters.
Use the current respondent URL rather than a builder URL. - Open the link with a harmless test value and complete a synthetic response. Inspect the intended response detail or integration output.
- Test the link with the parameter missing and decide how the form should behave.
Check before you rely on it
For a campaign field named source, append &source=newsletter when the copied URL already contains a question mark. URL-encode the value.
If you need help
Anyone with the link can inspect or change its query parameters. Do not use a hidden field as authorization.
Contact support with the relevant screen, time, and a redacted description. Keep credentials and private respondent information out of screenshots.