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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.
FYI: Jsdocs (and IntelliSense) have some problems with ES6 modules when using the `.mjs` extension (standard extension for ECMAScript modules and, as I understand (or read somewhere), is required by some browsers). I Filed a [bug report](https://github.com/microsoft/TypeScript/issues/47037) on vscode (which got transferred to the typescript repo, which, apparently?, handles the syntax highlighting and stuff for javascript in vscode.) This got closed later as it appeared that this bug seamed fixed in the the [current insider (1.63.0)](https://code.visualstudio.com/insiders/#), beta?, version of vscode.