I'm not sure if it comes from a plugin or not, but that's one of the options I have in VSCodes language dropdown, JSON with comments, and it's exactly what the

I'm not sure if it comes from a plugin or not, but that's one of the options I have in VSCodes language dropdown, JSON with comments, and it's exactly what the name says, it's json, but it doesn't die on // style comments. It also kicks in if I name the file with .jsonc as the extension.