Yes, CSV is superior to JSON for tabular data, but has it's own issues. One issue is that the standard is not consistently applied. Another is the approach to escaping means that it is hard to parse a CSV file with multiple threads. You have to parse the entire file before you can be sure which " characters escape other characters.
Until you try to either cram it into Excel, work with different encodings or pass it around different software platforms (even your lang vs JS), no difference.
CSV has been abused a lot to make it work on conflicting use-cases, JSON handles a lot of misshaps happened with delimiter-separated record formats, like new-lines or bring-your-own-character encoding.
Can't you just do this?
That's valid JSON but it's human-readable and human-editable rows of comma-separated data, just like CSV.