About this API
The "Connecticut Business Registry — Business Master" dataset is the master table of business entities registered in Connecticut, maintained by the Business Services Division of the Secretary of the State. Each record carries the entity name, legal type, registration status, account number, registration dates, address fields and ownership flags (for example woman-, veteran- or minority-owned). The data is refreshed daily and served through the Socrata SODA API, so it accepts the standard query parameters: $limit, $offset, $where, $select and $order. Responses are returned as JSON (CSV and GeoJSON are also available), with no API key and an open CORS "*" header.
Frequently asked questions
Do I need an API key?
No. The SODA REST endpoint works without an API key — a plain GET request is enough. Socrata recommends an optional app token for heavier traffic to avoid throttling, but it is not required.
What data does this API return?
The master entity table from the Connecticut business registry: entity name, type and status, account number, registration dates, addresses (billing, mailing, records), NAICS codes and ownership flags. The data is refreshed daily.
Can this API be called directly from a browser?
Yes. The endpoint returns an Access-Control-Allow-Origin: * header, so you can call it directly from front-end code (fetch/XHR) — which is why this entry has a working "Try it" button.
Who runs this API?
The Connecticut Secretary of the State (Business Services Division), publishing the data on the state's official open-data portal data.ct.gov, which runs on the Socrata platform (Tyler Technologies).