Modifying field groups exposed via the REST API

You may override the field groups that render via the REST API by using the acfrs/rest/export_field_groups filter. This filter makes it possible to:

1. Add field groups that are not already available.
2. Remove field groups.
3. Modify field groups and their fields in order to protect any data that should not be exposed.

Examples

You may use any of these examples in your theme's functions.php file, a custom plugin, or an mu-plugin. You may also use a snippet manager plugin.

Add an ACF field group

add_filter( 'acfrs/rest/export_field_groups', function ( $field_groups, $request ) {

    $field_groups[] = [
        'key' => 'group_0987654321',
        'title' => 'My new field group',
        'fields' => [
            [
                'key' => 'field_0987654321',
                'label' => 'My new field',
                'name' => 'my_new_field',
                'type' => 'text',
            ],
        ],
    ];

    // Return modified field groups array.
    return $field_groups;
}, 10, 2 );

Remove an ACF field group

add_filter( 'acfrs/rest/export_field_groups', function ( $field_groups, $request ) {

    // Remove the field group with the key 'group_1234567890'.
    foreach ( $field_groups as $index => $group ) {
        if ( $group['key'] === 'group_1234567890' ) {
            unset( $field_groups[ $index ] );
        }
    }

    // Return modified field groups array.
    return $field_groups;
}, 10, 2 );

Modify an ACF field group and/or its fields

add_filter( 'acfrs/rest/export_field_groups', function ( $field_groups, $request ) {

    // Modify a field group.
    $field_groups = array_map( function ( $group ) {

        if ( $group['key'] === 'group_639c42fde73e0' ) {

            // Modify the title of the field group.
            $group['title'] = 'My modified field group';

            // Modify the fields array.
            $group['fields'] = array_map( function ( $field ) {

                // Modify the label of a specific field.
                if ( $field['key'] === 'field_639c42fe7aa58' ) {
                    $field['label'] = 'My modified field';
                }

                return $field;

            }, $group['fields'] );

            // Unset a field.
            foreach ( $group['fields'] as $index => $field ) {
                if ( $field['key'] === 'field_639c42fe7aa58' ) {
                    unset( $group['fields'][ $index ] );
                }
            }
        }

        return $group;

    }, $field_groups );

    // Return modified field groups array.
    return $field_groups;
}, 10, 2 );