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Summand documentation

Validate XRechnung, ZUGFeRD and Factur-X e-invoices against EN 16931 in pure TypeScript: in Node, the browser and at the edge, without Java.

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IntroductionWhat Summand is, which e-invoices it checks, how close it is to the official validator, and what it does not do.
Getting startedInstall Summand and validate your first XRechnung or ZUGFeRD invoice.

Guides

Validating invoicesvalidateInvoice in detail - input types, options, the result object and how to show errors to people.
Profiles and rule setsWhich rules Summand applies for XRechnung, ZUGFeRD, Factur-X and Peppol invoices.
ZUGFeRD and Factur-X PDFsHow Summand finds the invoice XML in a hybrid PDF and what it checks about the PDF.
In the browserValidate uploads on the client before they reach your server, without sending invoices anywhere.
CLIValidate invoices from the command line or in CI, extract XML from PDFs and check Leitweg-IDs.
Leitweg-IDCheck the routing identifier German public buyers require in XRechnung invoices.
Schematron and XPathUse Summand's XPath 2.0 and Schematron engine for your own rules, e.g. company-specific invoice checks.

Pro

Summand ProRead invoices into typed objects, show them as readable HTML with the validation report, and validate whole inboxes with reports, duplicates and an audit trail.

Reference