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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.
Once you have R installed, it is also useful to have an integrated development environment (IDE): pick either the free RStudio Desktop or VS Code with R language support.
The app is served to the client (app user) through a host (Internet Protocol or IP address) and port number. The server then keeps a websocket connection open to receive requests. The R session behind the app will make sure this request translates into the desired interactivity and sends back the response, usually and updated object, like a plot or a table.