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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.
If you need SEO, you can't use skeletons because robots will see them when they crawl instead of your SEO page content. Then your best bet is showing a loading indicator on the page from which you made the request. I like nprogress, it shows a loading progress bar in the top part of the window, same as the native browser progress bar on page refresh. Really simple to use and does the job of informing the user that something is going on in the background. There are even some Next.js wrappers for it out there, but it's really simple to implement your own as well.