Auto-detecting file types taught me guesses need an escape hatch
I shipped a single endpoint that takes any document and returns Markdown, and the first week was mostly about the bytes before the conversion. PDF, DOCX, PPTX, XLSX, EPUB, HTML — none of them announce themselves reliably. Magic numbers lie, extensions lie more, and a PDF renamed .txt is still a PDF…
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- 2026-11-08 04:02 · DEV Community — AI
Auto-detecting file types taught me guesses need an escape hatch