[liuyanghejerry]

Part of me is also with you - JSON is indeed smaller than XML , but we do have gzip almost everywhere around the web, and with gzip, they don't have that much difference on space. Also, if people really care about this, why don't they use binary format, such as something like protobuf?

And the other part of me is not with you - manipulating XML is not as easy as JSON in most of my development time, and sometimes I even need to write something by my bare hands, which JSON is much more handy. Tons of other formats are more human-friendly than JSON, for example TOML, but they don't have the status JSON has. So I guess JSON is kinda choice under the current state of "web development times".