acf/schema/debug

Documentation Filters acf/schema/debug

Last updated Mar 31, 2026

Overview

Enable debug HTML comments showing JSON-LD processing steps.

Description

This filter enables debug mode for JSON-LD output. When enabled, ACF outputs HTML comments showing each step of the JSON-LD processing, including which post types are checked, which fields are found, and why output may be skipped.

This is useful for troubleshooting when JSON-LD is not appearing as expected.

Changelog

• Added in version 6.8.0

Parameters

apply_filters( 'acf/schema/debug', $debug );

• $debug (bool) Whether to output debug comments. Default: false

Return

(bool) Whether debug mode is enabled.

Example

This example enables debug mode.

add_filter( 'acf/schema/debug', '__return_true' );

This example enables debug mode only for administrators.

/**
 * Enable JSON-LD debug mode for admins only.
 *
 * @param bool $debug Whether debug mode is enabled.
 * @return bool Modified debug setting.
 */
function my_acf_schema_debug_for_admins( $debug ) {
    if ( current_user_can( 'manage_options' ) ) {
        return true;
    }
    return $debug;
}
add_filter( 'acf/schema/debug', 'my_acf_schema_debug_for_admins' );

Debug Output

When enabled, you’ll see HTML comments like:

<!-- ACF AI JSON-LD: Checking post type: recipe -->
<!-- ACF AI JSON-LD: Found 8 ACF fields -->
<!-- ACF AI JSON-LD: Processing field 'prep_time' with schema_property 'prepTime' -->

Or when output is skipped:

<!-- ACF AI JSON-LD: Post type 'post' does not have JSON-LD enabled -->

Related

• Filters: acf/schema/block_jsonld_enabled
• Features: Structured Data for ACF Blocks
• Filters: acf/schema/post_field_objects
• Filters: acf/schema/block_field_objects
• Filters: acf/schema/auto_add_image