VIES API Client for JavaScript

The `viesapi-client` is the official JavaScript library for interacting with the VIES API, which provides services for querying the European Union's VAT Information Exchange System. This client enables developers to validate EU VAT numbers, retrieve company details, and check the registration status of businesses across all EU member states. Currently at version 1.3.3, the library is actively maintained with regular updates and ships with full TypeScript type definitions. It supports both Node.js and browser environments, offering built-in authentication, request signing, and comprehensive error handling. Key differentiators include its ability to perform both synchronous single-number lookups and asynchronous batch processing, along with utility functions for local validation of EU VAT and Polish NIP numbers prior to making API requests. The library handles the intricacies of communicating with the VIES system, simplifying the process for developers.