Description
This constant helps debugging problems with AJAX forms by allowing the contents of the AJAX iframe to be viewed. Set the constant to true to display the contents.
Note: To load the non-minified versions of Gravity Forms legacy scripts and styles for debugging purposes, you can enable SCRIPT_DEBUG. Legacy files are those located in /gravityforms/css/ and /gravityforms/js/. New files are located in /gravityforms/assets/, and don’t have non-minified versions.
Usage
define( 'GF_DEBUG', true );
Placement
This constant should be set in your wp-config.php. See the article WP Config Options for more details.