Drupal 10: Getting A Field Label From A Field Name

Let's say you have a field machine name, which might have come from a variety of situations.

$fieldMachineName = 'field_some_field';

You can get the field label from the entity itself, if you have that loaded.

$fieldLabel = $node->get($fieldMachineName)->getFieldDefinition()->getLabel();

Or, you can use the entity_field.manager service to grab the field label from the field definitions.

$definitions = \Drupal::service('entity_field.manager')->getFieldDefinitions('node', 'page');
$fieldLabel = $definitions[$fieldMachineName]->getLabel();

This code is really useful when printing validation errors as you'll want to tell the user where the validation error was in terms they understand.

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