n8n Expressions: Почему $json.Name работает, а вопрос формы с пробелом — нет (нотация скобок, элементы и безопасное значение по умолчанию)

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n8n Expressions: Why $json.Name Works and a Form Question With a Space Doesn't (Bracket Notation, Items and a Safe Default)

The first n8n workflow I teach is two nodes and no other apps: On form submission hosts a form with two questions: Name and What do you need help with? Edit Fields (Set) writes a one-line summary of each inquiry. The made-up business is a bookkeeping firm that gets new client inquiries by phone, email and sticky note, and loses some. The fix is one form that catches all of them. It's a good first workflow because the only "code" in it is one expression, and that one expression teaches th