What's the simplest way to detect if a question was asked by a user whose account has been deleted?

Question

What's the minimum filter and simplest way to detect if a question (by its ID) was asked by a user whose account has been deleted?

Answer 1

I've finally found one such question.

From the \question\{id}\ route you need the !YwUIfd5b6 filter:

1. items from .wrapper
2. owner from question
3. user_type from shallow_user

If you get {"items":[{"owner":{"user_type":"does_not_exist"}}]} as a response, the owner has been deleted. Sample query.

(If you instead get {"items":[]} then the ID is not a question's or the question has been deleted.)