Validate tax identification numbers (TIN, VAT, EIN, GST, ITIN, SSN) for 76+ countries. Regex, checksum, and online VIES/government verification. TypeScript-first with LLM tool definitions.

Simple package to validate a german tax ID (Steuerindentifikationsnummer)

A lightweight, zero-dependency, and universal TypeScript library to validate Tax IDs (Identification Numbers)

Standard Number Validation

A Europe VAT number validation lib

A Europe VAT number validation lib

MCP server for Clearvo — submit invoices, calculate tax, validate tax numbers via Claude Code, Cursor, or any MCP-compatible AI tool

Medusa Tax module

International sales tax calculator for Node (offline, but provides optional online VAT number fraud check). Tax rates are kept up-to-date.

TaxJar Sales Tax API for Node

Check if a buffer contains valid UTF-8

Give me a string and I'll tell you if it's a valid npm package name

Your AI agent, fluent in Australian tax. MCP server with cited answers from 34,500+ ATO documents, the income tax and GST Acts and 4,900+ rulings, plus deduction, depreciation, BAS and audit-risk tools that know your tax profile.

Offline HTML5 validator and linter

Fully typed application that generates, parses, and validates SHAAM uniform format tax reports (INI.TXT and BKMVDATA.TXT).

Tax SDK for Awaken

Generic configuration validation tool that helps you with warnings, errors and deprecation messages as well as showing users examples of correct configuration.

Validates if a value is an array.

Validates if a value is a function.

A simple and composable way to validate data in JavaScript (and TypeScript).