This is the standard approach to identify a vs. an existing user being updated.
To hook into the user registration process in Drupal 8 (and 9/10+), you typically use entity hooks since users are treated as content entities. 🛠️ Recommended Hooks drupal-8-user-register-hook
Do you need help on the registration form, or are you looking to redirect users after they sign up? This is the standard approach to identify a vs
The most effective way to intercept or modify user data during registration is through the following hooks: Usage Note Runs before the user is saved. 🛠️ Recommended Hooks Do you need help on
Best for modifying data (e.g., adding a default role) before it hits the database. Runs after the user is created.
Use this for actions that require the new User ID, like sending a custom welcome email or creating related profile entries. Modifies the registration form .
If you need to stop registration based on custom business logic (e.g., checking an external blacklist), use a custom validation handler via hook_form_alter .