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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
palm-pdb (github.com/jichu4n/palm-pdb) provides a JavaScript / TypeScript API for reading and writing Palm OS PDB and PRC files. While it doesn't directly communicate with a Palm OS device (i.e. HotSync), it can be used to parse PDB / PRC files backed up from a device, or to produce PDB / PRC files that can be synced to a device. It supports out-of-the-box the core PIM application formats (Memo Pad, Date Book, Address and To Do List), as well as PalmDOC documents. It also provides tools for implementing your own formats.
This is awesome work Chuan! I have been using my little app (https://github.com/lxmx/pimsync) to get the PIM databases to and from the SD card and onto JPilot which reads them natively. Now with your library it will be possible to get other desktop sync scenarios working! Also you might find a similar Python library interesting: https://www.nkorth.com/palm/coldsync/ (scroll to python-palm) although I'm not sure what its capabilities are.