Spain's BORME Company Registry Has a Free Open-Data API Most Developers Overlook
Spain's official commercial registry gazette, BORME, publishes all company events — including incorporations, director changes, and insolvencies — via a free, no-auth open-data API on boe.es that has existed since 2009. Despite this, most developers have continued scraping PDFs, unaware of the structured XML alternative. A development team recently completed a full backfill of the API, collecting 9.5 million company events across 3.2 million companies spanning 2009 to the present. The exercise revealed several technical pitfalls, including misleading HTTP status codes, inconsistent date formats, regional formatting differences, and complex multi-act text entries requiring careful parsing logic. The team recommends a deterministic vocabulary-based scanner over regex or AI approaches, and advises tracking unparsed characters per file as a key quality metric to catch silent data loss.
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