There are, but Go's type system doesn't really accommodate them very well. `interface{}` tends to abound, and it tends to feel less magical because you're still generally wiring things up yourself (i.e. you still have to explicitly unmarshal the request JSON).

In some ways, that explicitness is better because you know what's happening. In other ways, I'm incredibly tired of typing out 'if err := req.Bind(myStruct); err != nil { return err }'.