EN 16931 e-Invoice Lint

Runs the same checker as our npm package on a Node.js runtime that pip installs for you (nodejs-wheel-binaries) - no system Node.js needed. Your files are checked locally.

Checks an invoice payload or field mapping against EN 16931 and the national CIUS of the country it detects — 29 rules, in your editor.

Install

en16931-einvoice-lint file

Node 18+. The same 29 rules as the VS Code extension, from a terminal or CI.

Free

• Check the invoice payload or field mapping open in your editor against all 29 rules, with every finding and every fix shown
• --rules lists every rule

With a licence ($29 once)

• Sweep every invoice mapping in the workspace in one pass and write a dated report file you keep, commit and hand to an auditor

en16931-einvoice-lint --dir ./templates --report html --out report.html

A German tax adviser's time fee is fixed by StBVV § 13 at EUR 30-70 per half hour (EUR 60-140 an hour); one review of one invoice mapping costs more than this licence.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "en16931-einvoice-lint": { "command": "en16931-einvoice-lint", "args": ["--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: EN 16931 e-Invoice Lint
  run: pip install rulestamp-en16931-einvoice-lint && en16931-einvoice-lint --dir . --ci

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence

Install (PyPI)

pip install rulestamp-en16931-einvoice-lint
en16931-einvoice-lint --help