dplyr, httr, jsonlite, purrr, readr, stringr, tibble
knitr, dplyr, ggplot2, rmarkdown, testthat
knitr, ggplot2, rmarkdown, testthat, tidyr
jsonlite, knitr, readr, rmarkdown, tidyverse, xml2
dplyr, ggplot2, jsonlite, knitr, readr, rmarkdown, tidyr