How can I add an extra field in Drupal 8 menu Item. I want to add an extra image field -

how can add field in drupal 8 menu item? want add image field can use display along menu.

you can add through code , run update.php or drush command updatedb.

you can check answers here: https://drupal.stackexchange.com/questions/205058/how-to-add-fields-to-menu-items

also check comments because had problems , i've left solution in comments.