It feels like AI has made this redundant.
I honestly cannot imagine hand typing out some JSON now, or most code for that matter.
I just write in natural language what I want and the AI will perfectly output valid JSON.
Just being able to add comments to a .JSON5 file is a godsend though, no matter who/what created it.
Oh... and TRAILING COMMAS!
That JSON you get might be syntactically valid, but how do you know that it is accurate wrt your original input? That, for example, no values have a one-character-off misspelling?