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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.
Pick whichever one you want to focus on. It's hard to know this for a fact (since gathering stats on such a thing is difficult at best), but React is probably the most popular SPA library, with Vue and Angular (the modern Angular, not AngularJS) being second and third (though I don't know which would be which).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.