You should always remember that, you should not use a technology just because there are a few biggies using it. Then, you must question why JSON? Though there are a lot of people calling JSON whois “lightweight.”, do you really know what does that mean? Have you ever tried understanding how whois api of JSON different from that of XML?
Know that the ratio of markup to content with JSON is far lower in comparison to XML which automatically makes it smaller reducing the complexity as well. This in turn has a greater impact on retrieving and reading the data easily as well. The load time is faster for the web pages and ultimately you would be able to send more data and faster than any other data formats. Hence, it becomes important that you use JSON whois.
Example for a JSON code
This does not mean that XML is worthless; these arguments are made in order to showcase the strengths of JSON. Both the file formats have their strengths in their areas and can be used based on the skill set of a programmer.