BoyerMarketing/API-DGII-RNC-NO-OFICIAL ? reverse-engineered prompt

Build me a small Node.js app that lets people look up businesses and taxpayers in the Dominican Republic by RNC, by name, or with a more advanced search.

I want it to work like a simple REST API with JSON responses, plus a clean web page that explains how to use it and includes a live demo form. It should automatically download the official DGII dataset, unzip it, read the TXT file, and keep the data updated locally so searches are fast. Please make sure it can handle searches by exact RNC, partial name matches, and a general search with multiple filters. Add a health endpoint, a dataset endpoint, CORS, basic validation, and sensible error messages.

If you need to check current library docs online, go ahead. Keep it simple to run locally, with a start command and a development command, and make the UI responsive and easy to understand.