To batch convert XML files to JSON a nodejs package can be used that does the job pretty well.
Install the package globally:
npm install xml-json -g
the format of the command is
xml-json input.xml root_node_to_start_from_in_xml
And so we use our friend inline loop with the basic command to batch process all the *.xml
files in the current folder
for f in *.xml; do xml-json $f root_node_name_here > $f.json; done