The JWT Prefill add-on helps you prefill Gravity Forms fields with data you can trust. Instead of relying on editable URL parameters, it uses signed JSON Web Tokens to populate fields and verify that the token is valid before the form loads.
If your forms handle sensitive, business-critical, or user-specific data, JWT Prefill is one of the most valuable GravityWP add-ons to consider.
GravityWP describes JWT Prefill as a secure way to populate form fields dynamically from signed tokens. It supports pulling values from JWT claims, validating token timing, and controlling access with allow or deny lists.
That gives you much more confidence in prefilled values when a form is used for:
- account updates
- renewal and payment-related flows
- support or claims workflows
- invitation-based forms
- approval or confirmation steps
Standard query string prefilling is convenient, but it is not always trustworthy. If a value in the URL can be changed easily, it may not be suitable for workflows where prefilled information affects logic, records, access, or fulfillment.
JWT Prefill is a strong fit when you want:
- tamper-resistant prefilling
- control over token validity windows
- safer handling of user-specific or order-specific data
- a cleaner approach to secure links and guided form flows
JWT Prefill works especially well for:
- sending personalized form links to customers
- prefilling IDs, account references, or order details
- secure invitation or approval flows
- workflows where the user should see data but not control its source
Choose JWT Prefill when you need to trust the prefilled data and want stronger protection against tampering.
Simple query string prefilling can still be fine for low-risk convenience, but JWT Prefill is the better option for higher-trust workflows.
JWT Prefill is best for:
- businesses handling sensitive customer data
- developers building secure guided form experiences
- teams that send users personalized form links
- sites where prefilled data affects business logic or downstream processes
If your current Gravity Forms prefill setup relies on editable URL parameters and that feels risky, JWT Prefill is the clear upgrade. It brings a stronger security model to a common workflow and is one of the most distinctive add-ons in the GravityWP catalog.
Related guides: Best Gravity Forms add-ons from GravityWP, Advanced Merge Tags for Gravity Forms, API Connector for Gravity Forms