Drupal: Programmatically validate a node?

Drupal: Programmatically validate a node?

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8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ]
8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ]
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8/22 How to create a custom validation constraint with Drupal 9 & 10 entities [ preview ]

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