The threft application is the user front-end for threft code generation. It parses .thrift files and invokes a generator which generates code.
Marshalling is done with tidm-json
For marshalling/unmarshalling: consider rjson (readable json): http://rogpeppe.wordpress.com/2012/09/24/goson-readable-json/http://go.pkgdoc.org/launchpad.net/rjson for rjson: test speed and stability, as well as functionality compared to encoding/json