If you have a directory path with many JSON files in it and you want them all on a single document for batch edits use JS
find . -name '*.json' -exec cat '{}' + | jq -s '.' > /Users/staff/Desktop/newjsonsinglefile.json
To reduce the process time for exceedingly large examples, you may be able to simply use
find . -name '*.json' -exec jq -s '{}' + > /Users/staff/Desktop/newjsonsinglefile.json