Quickly download the data from the Database of Global Administrative Areas (GADM), with the desired administration level of the selected country. As this script uses the sf package, it requires GDAL, GEOS and PROJ to be executed properly.
Through a Bash terminal, clone the repository
git clone git@github.com:96francesco/get-gadm-data.git
Move to the cloned project folder
cd get-gadm-data
Execute the R script indicating the country (between quotes), the administrative leve (0, 1, or 2, depending on the country) and the desired output extension (between quotes - json, kmz, gpkg or shp). For instance, to download Italian province borders as JSON file:
Rscript main.R 'Italy' 2 'json'
The downloaded will be placed in the folder get-gadm-data/output.