I want prevent any user from being able to change the value of a field, yet I want to display its value.

How can I achieve this?


This can be done via hook_form_alter

function mymodule_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) {

   if($form_id == 'user_register_form') {
      $form['field_name']['widget'][0]['value']['#attributes']['readonly'] = 'readonly';


Add some css:

input:read-only {
  background-color: #ddd !important;


enter image description here


And Just as a Reference, another solution is using the #disabled attribute:

function mymodule_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'user_register_form') {
    $form['field_name']['#disabled'] = TRUE;

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