[slaymaker1907]

The reason why you don’t need some big, formal JSON schema (though they do exist) is because you can notate most of the constraints people care about in TypeScript. It’s just a bunch of structs, arrays, string enums, etc. XML doesn’t really have a nice mapping to type systems like that so it needs schemas.

My coup de grace against XML is that it is wholly unsuitable for serializing arbitrary strings in most programming languages. It’s defeated by quite simple strings like “hello\0world”. You can’t just escape the null using &#; because the standard, in its infinite wisdom, forbids it. Instead, you’re just expected to come up with some completely non-standard way like <null-char /> or just interpret “\0” specially in your application code. Meanwhile, JSON just lets you put pretty much whatever Unicode you want into a string with a standard way of escaping characters like the double quote.