This has, in turn, fostered the creation of automated tools for validating specific messages against the specification. JSON Schema borrows some ideas from XSD, the XML format for defining XML ...

But you can also use your JSON schemas at run time to validate JSON files or messages, ensuring your code doesn't try to process something that isn't correctly formatted. Validating at Run Time A ...

Oh noez not the “gzipped json is just as good” idea! I’ve actually heard that as a real argument against msgpack, because some people will do anything to get rid of an extra dependancy.