For my next paper I am going to provide a link to an interactive data visualization created using Rstudio's Shiny framework. How can I properly cite it?
You could cite it the way you would cite R packages, example: https://www.r-bloggers.com/how-to-cite-packages/
Or you can check out how it is cited following different citation benchmarks using Google scholar. See here on Yihui Xie's page
Or you can indeed cite it as a website, as @ff524 added.