Self-service invoice validator (upload form)

I run n8n as the automation layer for a B2B online shop. Our suppliers send invoices in every shape we buy into — XRechnung XML, ZUGFeRD hybrids, plain PDFs. Before any downstream workflow (booking, reconciliation, payment run) touches a file, I want to know whether it actually parses and validates. Opening an XML in a text editor is useless, and running a desktop validator per invoice is an eight-click detour nobody keeps up with.

So I wired this up: a native n8n form that takes a file and a country, and returns VALID, INVALID, or PARSE ERROR together with the extracted invoice number, seller, buyer, and total. No Gmail, no Sheets, no Drive — the form is the whole UI. I keep the URL for myself most days and share it with whoever on the team needs a quick check.

Under the hood: form input → small Code node to turn the dropdown value into an ISO country code → invoice-api.xhub parse with auto-detect → validate against the country profile → form response with the verdict and fields.

Setup

Install n8n-nodes-invoice-api-xhub via Settings → Community Nodes. Add an invoice-api.xhub credential; free sandbox keys are available. Activate the workflow, copy the URL the Upload Form node prints, done.

Good to know

• Works for every country the API supports. I left the common European ones in the dropdown because that's what we see; trim it to your reality.
• The response is JSON you can read in the browser tab. If you want HTML output, swap the final response node for a Set + HTML stage.