// Register Yoast SEO fields in WP REST API — correct approach add_action('rest_api_init', function() { $post_types = ['post', 'page']; $yoast_fields = [ '_yoast_wpseo_title' => '_yoast_wpseo_title', '_yoast_wpseo_metadesc' => '_yoast_wpseo_metadesc', '_yoast_wpseo_focuskw' => '_yoast_wpseo_focuskw', ]; foreach ($post_types as $post_type) { foreach ($yoast_fields as $field => $meta_key) { register_rest_field($post_type, $field, [ 'get_callback' => function($post) use ($meta_key) { return get_post_meta($post['id'], $meta_key, true); }, 'update_callback' => function($value, $post) use ($meta_key) { // Use WPSEO_Meta if available (triggers Yoast's own save) if (class_exists('WPSEO_Meta')) { $clean_key = str_replace('_yoast_wpseo_', '', $meta_key); WPSEO_Meta::set_value($clean_key, sanitize_text_field($value), $post->ID); } else { update_post_meta($post->ID, $meta_key, sanitize_text_field($value)); } }, 'schema' => ['type' => 'string'], ]); } } });