I need to get in hook_node_insert and hook_node_update the value of a field I manually added to a form.

function hook_form_FORMID_alter(&$form, FormStateInterface $formState, $form_id) {

  $form['newfield'] = [
    '#title' => 'New field',
    '#type' => 'checkbox',

In Drupal 7 every form field is copied to the entity and it's easy to access it as explained here Get data form into hook_node_insert / hook_node_update

Is there a way in Drupal 8 too?

1 Answer 1


Use an entity builder callback on the form, for example:

function menu_ui_form_node_form_alter(&$form, FormStateInterface $form_state) {
  // ...
  $form['#entity_builders'][] = 'menu_ui_node_builder';

 * Entity form builder to add the menu information to the node.
function menu_ui_node_builder($entity_type, NodeInterface $entity, &$form, FormStateInterface $form_state) {
  $entity->menu = $form_state->getValue('menu');
  • It works despite I get the warning "Field declared dynamically", but I can live with it :) Dec 12, 2018 at 8:05
  • Well, depending on what you do with it, you can also just use a regular submit callback, you can access the entity with $form_state->getFormObject()->getEntity() for an entity form. Only use this if you actually need that information to be able during the hooks and then maybe consider to just make it a field..
    – Berdir
    Dec 13, 2018 at 11:59

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