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.
surveyjs.io
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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.
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natural-earth-vector
A global, public domain map dataset available at three scales and featuring tightly integrated vector and raster data.
Download the planet file, extract country boundaries based on admin_level using Osmosis.
Probably not useful for you, but https://github.com/pietervdvn/latlon2country/ has a 'tiles.zip', where all the boundaries are tiled into small pieces.
Go get this data from https://www.naturalearthdata.com/
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