I spend all my time doing front-end development and I'm not sure what the author means by "I look forward to seeing what the JSON folks do when they are asked t

I spend all my time doing front-end development and I'm not sure what the author means by "I look forward to seeing what the JSON folks do when they are asked to develop richer APIs". The only deliberately unstructured XML I've worked with is document formats. Where are these rich unstructured APIs that wouldn't otherwise be classified as lazy?