Drupal 11: Show The Route Of The Current Page

Use the following to see the route of the current page.

/**
 * Implements hook_preprocess_page().
 *
 */
function mycustomtheme_preprocess_page(&$variables) {
  \Drupal::messenger()->addStatus(\Drupal::routeMatch()->getRouteName());
}

Add this to your theme file or a module file and clear the caches.

If you visit a page on this theme you will see a message being shown on the site. For example, the user profile page will show this.

entity.user.canonical