LensUp shares three hard-won lessons from building a fully browser-based document scanner

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The team behind LensUp, a browser-only document scanning tool that converts photos into PDFs without uploading files to a server, has detailed three technical challenges encountered during development. A key issue involved the Web Share API's transient user activation requirement, which expires before PDF generation completes on slower devices, causing silent failures. Their fix decouples the PDF preparation step from the share action, using navigator.userActivation.isActive to detect whether activation is still valid and prompting a second tap when it is not. The team also highlighted that detecting file-sharing support requires testing with an actual File object via navigator.canShare, since the basic 'share' in navigator check does not confirm file-sharing capability. These findings were shared as practical guidance for developers building similar client-side file-processing pipelines in the browser.

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PM Brain: Open-Source AI Memory System Built on Plain Markdown, Not Vector DBs

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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