It would be nice to have same infile and outfile for json.tool to replace json files with their pretty-printed version. Currently, if I try this I get an error: $ python3 -m json.tool example.json ...

Yes, the file csv file is about 50MB and I have max_allowed_packet set to 250MB. As I mentioned it's odd that the exact same load statement on the same database works using other libraries but just ...