jspb is a plugin for protocol buffers compiler which translates protocol buffer messages into JavaScript (closure library) objects. The generated closure objects are simply thin wrappers on JSON data.
jspb uses the same 3-clause BSD license and keeps the original copyright information from goprotobuf.
go get github.com/linuxerwang/jspb/protoc-gen-jspb
Examples can be found at the examples directory. The Makefile shows how to run the compiler to generate jspb objects.