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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.
Other conveniences may include any kind of build-time transformations; like for example JSX. Nobody wants to write createElement calls by hand, but JSX will not run in a browser as is. The same goes for TypeScript. Developers evidently are very happy writing types in their source code (and will get very upset when you tell them you can use TypeScript without compiling your code), but alas, TypeScript source code does not run natively in the browser. Not until the Type Annotations proposal lands anyway, which is only stage 1 at the time of writing.
None of these examples will actually work in a browser, because they are non-standard. Some of you might have correctly spotted that a browser standard exists for two of the imports pointed out in the example, namely the Import Attributes proposal (previously known as Import Assertions), but these imports in their current shape will not work natively in a browser. Many of these non-standard imports exist for good reason; they are very convenient.