NormAPI

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NormAPI is an e-invoicing API for Germany's XRechnung and ZUGFeRD formats. The validator is free, needs no sign-up and stores nothing: upload an invoice (UBL, CII or ZUGFeRD PDF) and every problem comes back with its official rule code, where it occurs in the XML, and a plain-language explanation of how to fix it. Checks run against the current KoSIT rule set, and the version is stated on every result. For software teams, the same checks are available as a REST API, together with generation of XRechnung (UBL and CII) and ZUGFeRD PDFs from JSON. Every generated invoice is validated before it leaves the API, and rule-set updates are included: KoSIT publishes a new version roughly every six months, and integrations keep working unchanged. A TypeScript client is available on npm. Built for companies issuing e-invoices under the German mandate, and for the software vendors who generate them for their customers.