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Partly JSON unmarshal into a map in Go

My websocket server will receive and unmarshal JSON data. This data will always be wrapped in an object with key/value pairs. The key-string will act as value identifier, telling the Go server what kind of value it is. By knowing what type of value, I can then proceed to JSON unmarshal the value into the correct type of struct.

Each json-object might contain multiple key/value pairs.

Example JSON:

{
    "sendMsg":{"user":"ANisus","msg":"Trying to send a message"},
    "say":"Hello"
}

Is there any easy way using the "encoding/json" package to do this?

package main

import (
    "encoding/json"
    "fmt"
)

// the struct for the value of a "sendMsg"-command
type sendMsg struct {
    user string
    msg  string
}
// The type for the value of a "say"-command
type say string

func main(){
    data := []byte(`{"sendMsg":{"user":"ANisus","msg":"Trying to send a message"},"say":"Hello"}`)

    // This won't work because json.MapObject([]byte) doesn't exist
    objmap, err := json.MapObject(data)

    // This is what I wish the objmap to contain
    //var objmap = map[string][]byte {
    //  "sendMsg": []byte(`{"user":"ANisus","msg":"Trying to send a message"}`),
    //  "say": []byte(`"hello"`),
    //}
    fmt.Printf("%v", objmap)
}

Thanks for any kind of suggestion/help!

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