jasy

Pure TypeScript engine for generating and validating ZUGFeRD/XRechnung e-invoices.

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jasy is a free, open-source TypeScript toolkit that generates and validates ZUGFeRD and XRechnung e-invoices, deriving spec-correct EN-16931 totals and VAT breakdowns directly from line items and producing a conformant PDF/A-3 with embedded XML. Validation runs locally using the same official Schematron and veraPDF tools regulators use, with no upload or account required. It targets Node.js and TypeScript developers who need e-invoicing support without depending on Java or Python tooling.

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