Is there an [XSLT](http://www.w3.org/TR/xslt) equivalent for JSON? Something to allow me to do transformations on JSON like XSLT does to XML.
['https://Stackoverflow.com/questions/1618038', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/147141/']
Try [JOLT](https://github.com/bazaarvoice/jolt). It is a JSON to JSON transformation library written in Java. 

It was created specifically because we did not want to play the "JSON -> XML -> XSLT -> XML -> JSON" game, and using a template for any sufficiently complex transform is unmaintainable.
it is very possible to convert JSON using XSLT: you need JSON2SAX deserializer and SAX2JSON serializer.

Sample code in Java:
<http://www.gerixsoft.com/blog/json/xslt4json>