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You are viewing beta documentation for Formie 4.x.
Fields

Hidden

Use Hidden when the form needs to carry a value without showing it to the person filling out the form.

Hidden fields are useful for context, attribution, and routing data. Do not rely on them for security-sensitive decisions because hidden values can still be changed before submission.

Key settings

  • Default value - Set the value submitted with the form.
  • Value source - Populate from a custom value, URL, query string parameter, cookie or user-related context where supported.
  • Prefill query parameter - Read a value from a specific query string parameter.
  • Handle - Choose a stable field handle for integrations, templates and exports.

Submitted value

Hidden stores a submitted value like other fields, even though the user does not see a visible control. Treat it as user-modifiable browser data unless you set or validate it server-side.

When querying or saving submissions through GraphQL, the field handle is used as the field name. Query the form’s formFields and include inputTypeName if you need to confirm the generated input type for a specific form.

Theme config

The Hidden field can be targeted with the hiddenField theme config key.

{{ craft.formie.renderForm('contactForm', {
    themeConfig: {
        hiddenField: {
            field: {
                attributes: {
                    data: {
                        tracking: 'campaign',
                    },
                },
            },
        },
    },
}) }}

Hidden fields usually need little presentation customization. Use a template override only when the hidden input output itself needs to change.

For full Tailwind, Bootstrap and other framework examples, see Formie theme configs (opens new window).

Front-end reference

Hidden fields are still rendered into the page HTML. Do not place secrets, trusted prices, permission flags or other security-sensitive values in a hidden field without server-side validation.

The front-end docs live on the separate browser UI reference site and cover rendered markup, data attributes, styling classes and JavaScript behavior for custom front-end implementations.

Last updated: June 2, 2026, 3:48:37 PM
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