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Developer Guide Demonstrates JPG Filename Collision Handling for ZIP Archives

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A DEV Community article explains that two successful conversions can produce the same JPG output name, which can silently overwrite an earlier entry when a ZIP builder uses names as object keys. It proposes resolving names before archiving, using an educational allocator that normalizes and lowercases names for comparison and appends -N suffixes to duplicates. The allocator only assigns names and does not decode images or write archives. The author reports synthetic Node.js tests covering five valid input lists and nine rejected inputs, all passing on October 31, 2026. The article also cautions that suffixes do not encode source IDs, so a separate mapping is needed, and that the approach is not a complete secure filename sanitizer.

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