kosit

E-invoicing for PHP and Laravel (E-Rechnung): create, validate and read ZUGFeRD/Factur-X, XRechnung, UBL and Peppol BIS invoices based on EN 16931. Open source, MIT.

Code examples for creating and validating XRechnung 3.0 e-invoices (EN 16931 XML, KoSIT-compliant, CII and UBL syntax) via the InvoiceXML REST API. Samples in C#, Java, PHP, Python, Node.js, and browser JavaScript, plus AI-powered PDF to XRechnung conversion. Ready for German B2G invoicing via ZRE, OZG-RE, and Peppol.

C# / .NET client for creating and validating ZUGFeRD and XRechnung e-invoices with the InvoiceXML API

Node.js / TypeScript client for ZUGFeRD and XRechnung e-invoices via the InvoiceXML API: create, validate, embed, render and extract EN 16931 invoices.

Model Context Protocol (MCP) server for German Electronic Invoicing (ZUGFeRD 2.x / XRechnung 3.x). Provides tools to validate, generate, parse, and convert invoices compliant with EN 16931 and KoSIT. Vendor-neutral: builds, validates, and signs locally; optional Peppol transport uses any accredited access point.

32 German e-invoice examples: XRechnung (UBL, CII) and ZUGFeRD PDF, each validated with the KoSIT validator. Free test files, CC0. E-Rechnung Beispiele.

EN 16931, XRechnung and Peppol validation rules explained in German and English — with worked XML fragments, and the four rules that can never fire

MCP server for German e-invoice compliance — XRechnung 3.0 & ZUGFeRD 2.x. Validate, generate, parse, and check compliance of electronic invoices per EN 16931.

EN 16931 e-invoice validator for XRechnung, ZUGFeRD & Factur-X — pure Rust & WASI, runs the original KoSIT & Mustang artifacts, byte-identical to the reference validators.

EN 16931, XRechnung and Peppol validation rules explained in German and English — with worked XML fragments, and the four rules that can never fire

E-Rechnung in Python: XRechnung und ZUGFeRD lesen, prüfen (offizielle KoSIT-Regeln ohne Java), erstellen, anzeigen und als DATEV-Buchungsstapel exportieren. CLI, Python-Bibliothek, MCP-Server und 21 Anleitungen auf Deutsch.

PDF invoice in, valid German XRechnung or ZUGFeRD out. NVIDIA Nemotron on Nebius Token Factory proposes every value with a quote, the official KoSIT validator decides, missing facts are asked for.

Validierte XRechnung- und ZUGFeRD-Beispieldateien (EN 16931) mit deutschsprachiger Referenz zu BR-DE-Fehlercodes und Pflichtangaben

GitHub Action: validate XRechnung / ZUGFeRD / EN 16931 invoices in CI with the official KoSIT rules, no JVM

Cross-validator conformance matrix + GitHub Action for EN 16931 e-invoices: KoSIT/XRechnung, ZUGFeRD/Factur-X, Peppol BIS.

Archived case study: an agent-operated XRechnung release-regression checker — official KoSIT validator, Stripe checkout, fail-closed audited gates, and a bounded operator API for AI agents. Includes the post-mortem.

Self-hosted validator and viewer for e-invoices (ZUGFeRD, Factur-X, XRechnung, UBL, CII), based on Mustang and the KoSIT validator. Nothing is stored.

Offline-Prüfung von E-Rechnungen (XRechnung, ZUGFeRD/Factur-X, EN 16931) im Browser – Ergebnisse identisch mit dem offiziellen KoSIT-Validator

German B2B E-Rechnung MCP server: EN 16931, KoSIT XRechnung 3.0 & DATEV ZUGFeRD 2.5 PDF/A-3b

137 broken XRechnung 3.0.2 invoices (UBL + CII), one per German business rule, verified against the official KoSIT validator