ZUGFeRD Validator MCP Server: Install & Setup

Install ZUGFeRD Validator in Claude Code

Remote URL

Claude Code

claude mcp add --transport http zugferd-validator https://api.zugferd-validator.de/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "zugferd-validator": {
      "url": "https://api.zugferd-validator.de/mcp"
    }
  }
}

npm

Claude Code

claude mcp add zugferd-validator -e ZUGFERD_API_KEY=... -- npx -y zugferd-mcp-client

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "zugferd-validator": {
      "command": "npx",
      "args": [
        "-y",
        "zugferd-mcp-client"
      ],
      "env": {
        "ZUGFERD_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the ZUGFeRD Validator MCP server do?

Validiert E-Rechnungen (ZUGFeRD/Factur-X, XRechnung) gegen EN 16931 mit Korrekturvorschlägen.

Is the ZUGFeRD Validator MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does ZUGFeRD Validator run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add ZUGFeRD Validator to Claude Code?

Run: claude mcp add --transport http zugferd-validator https://api.zugferd-validator.de/mcp

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