$$BF_Model

This global variable contains the data model for the user's current page. You can read data from it or write data back into it using FileMaker's built-in JSON functions.

By default, the entire contents of the $$BF_Model variable is sent back to the client and merged with their existing data when the hook returns. This preserves client-side properties while updating server-controlled values. To modify this behavior (e.g., to force a complete replacement), see the $$BF_State page.

For keys configured with Sync with app, if the same key is returned in both $$BF_Model and $$BF_App in one hook response, the $$BF_App value is applied as the final synced value.

$$BF_State