TL;DR There is no JavaScript API in the WordPress core and no one is planned, but actually, there is no need of it. Backend First of all let’s say that, regarding the backend, some useful information can be fetched from already present JavaScript global variables (WordPress loves all global flavors). E.g. ajaxurl for the admin-ajax.php … Read more
wp_localize_script() calls the method localize() on the global variable $wp_scripts. We can set this variable to an instance of a child class of WP_Scripts: class Filterable_Scripts extends WP_Scripts { function localize( $handle, $object_name, $l10n ) { $l10n = apply_filters( ‘script_l10n’, $l10n, $handle, $object_name ); return parent::localize($handle, $object_name, $l10n); } } add_action( ‘wp_loaded’, function() { $GLOBALS[‘wp_scripts’] … Read more
Instead of using wp_localize_script in that case, you can hook your js variables at wp_head, that way it would be available to all js files like: function my_js_variables(){ ?> <script type=”text/javascript”> var ajaxurl=”<?php echo admin_url( “admin-ajax.php” ); ?>”; var ajaxnonce=”<?php echo wp_create_nonce( “itr_ajax_nonce” ); ?>”; </script><?php } add_action ( ‘wp_head’, ‘my_js_variables’ ) Also as suggested … Read more