some go

gistfile1.txt

package main

import "fmt"
import "encoding/json"

type Foo struct {
        Foo  string
        Body interface{}
}

var jsonBody = `
{
        "Foo": "bar",
        "Body": {
                "header": "value"
        }
}
`

func main() {
        foo := &Foo{}
        err := json.Unmarshal([]byte(jsonBody), foo)
        if err != nil {
                fmt.Println(err)
                return
        }
        fmt.Println(foo)
        bar, err := json.Marshal(foo.Body)
        if err != nil {
                fmt.Println(err)
                return
        }
        fmt.Println(string(bar))
}