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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.
I've used react-grid-layout for a client last month and it seems to work like that: the (x,y) coordinates are only guidelines and the layout engine will try and do its best to solve for size and position constraints.
https://www.npmjs.com/package/react-grid-layout
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