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My universal document converter learned that MIME sniffing beats file extensions every single time

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

I built a universal document-to-Markdown API that auto-detects file type and routes PDF, DOCX, PPTX, XLSX, EPUB, HTML or plain text to the right converter. The first version trusted the file extension completely. A user sent a .txt file that was actually a PDF — my API happily tried to parse binary…

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  1. 2026-10-20 03:06 · DEV Community — AI
    My universal document converter learned that MIME sniffing beats file extensions every single time

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