Originally published at vatnode.dev. The version on vatnode.dev is the canonical source — refer to it for the latest content.
Germany is the largest EU market for most B2B SaaS, and the German VIES node is one of the member-state paths engineering teams commonly build fallback logic around. If you are validating German VAT numbers in Node.js, the format check is the easy part. Getting a reliable answer when VIES DE is throttling or temporarily offline is the actual problem. Here is the full pipeline.
What a German VAT number looks like
Germany issues two different tax identifiers, and developers regularly confuse them:
USt-IdNr. (Umsatzsteuer-Identifikationsnummer) — the EU VAT ID. Format: DE + 9 digits. This is what goes on cross-border B2B invoices and what VIES validates.
