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Wayyyyy before comments, the one thing I'd want to see JSON support is effing trailing commas.

You might like JWCC, which literally stands for JSON With Commas and Comments.

https://nigeltao.github.io/blog/2021/json-with-commas-commen...

This one unambiguously seems like a mistake. Is there any steel man argument for why an extra comma should not be acceptable? Save a byte over the network?

Ecmascript is changing JS. JSON is old and unchanging. Which is an advantage and a disadvantage.

I think that’s literally the only argument for it. And if you use compression, now you have to waste an extra symbol on `”` in addition to `”,`, so even that’s debatable.

“ is already a symbol, but for formatted JSON it’s more likely to be “,\r and “\r

I bet `: “` is more common than a lonely double quote, except at the end of a list of quoted values.

Eh, who knows? But I’m skeptical that the omitted comma actually saves any space in common situations.

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