> Most important reason XML was replaced by JSON for the majority of use cases was the parser had a lot of complexity and wasn't implemented as well for other l

> Most important reason XML was replaced by JSON for the majority of use cases was the parser had a lot of complexity and wasn't implemented as well for other languages... I think it had more to do with: 1) An advantage of XML was supposed to be that it was human-readable, which meant it would be easier for developers to work with and debug. The problem was that many XML documents were so bloated with tags within tags within tags and redundant attributes all over the place, that in practice it was extremely painful for a human to read. JSON is better, in practice. 2) For better or for worse, JavaScript became ubiquitous, and there is a simple, clean isomorphism between JSON to in-memory JavaScript objects (obviously, since that's what the JSON name means).