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ZUGFeRD Validator

Official registry Other

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

Source code Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http zugferd-validator 'https://api.zugferd-validator.de/mcp' --header 'X-Api-Key: <API-Key von https://zugferd-validator.de/konto (Demo-Key: zv_demo_public_zugferd_2026)>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "zugferd-validator": {
            "type": "http",
            "url": "https://api.zugferd-validator.de/mcp",
            "headers": {
                "X-Api-Key": "<API-Key von https://zugferd-validator.de/konto (Demo-Key: zv_demo_public_zugferd_2026)>"
            }
        }
    }
}
NPM package zugferd-mcp-client
Claude Code 
claude mcp add zugferd-validator -e 'ZUGFERD_API_KEY=<your zugferd_api_key>' -- npx -y zugferd-mcp-client@1.1.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "zugferd-validator": {
            "command": "npx",
            "args": [
                "-y",
                "zugferd-mcp-client@1.1.1"
            ],
            "env": {
                "ZUGFERD_API_KEY": "<your zugferd_api_key>"
            }
        }
    }
}

Environment variables

  • ZUGFERD_API_KEY required secret API-Key von https://zugferd-validator.de/konto (Demo-Key: zv_demo_public_zugferd_2026)

Frequently asked questions

What is ZUGFeRD Validator?

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

How do I install ZUGFeRD Validator?

It runs as a remote server. In Claude Code: claude mcp add --transport http zugferd-validator 'https://api.zugferd-validator.de/mcp' --header 'X-Api-Key: <API-Key von https://zugferd-validator.de/konto (Demo-Key: zv_demo_public_zugferd_2026)>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does ZUGFeRD Validator need an API key?

Yes. It expects ZUGFERD_API_KEY, X-Api-Key, which you set in its configuration.

Is ZUGFeRD Validator open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains ZUGFeRD Validator?

It is published by tzatti1. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.