How to programatically hide node field on viewing?

Question

Using Drupal 9,

How do I hide a node field when viewing it?

Let's say I have field info. I would like to conditionally not display the label or the value.

I assume I use hook_node_view_alter but I'm not familiar with how to manipulate the build render array.

Thanks!

Answer 1

You could make use of the hook_preprocess. If its on the specific entity such as the case of a paragraph it will look something like this where I am hiding some labels from a view based on some condition:

function [MODULE_NAME]_preprocess_paragraph(&$variables){
    $paragraph = $variables['paragraph'];
    // Get the parent bundle.
    $parentBundle = $paragraph->getParentEntity()->bundle();
    //check View type
    if ($parentBundle && $parentBundle == 'category_views') {
      if ($variables['content']['field_language_name']['#object']->get('field_language_name')->value != 'English') {
       //Removing labels
        unset($variables['content']['field_language_name']);
        unset($variables['content']['field_language']);
      }
    }
}