package main

import (
        "fmt"
        "strings"
        "encoding/json"
)

func main() {
        // normales Struct
        const jsonBody = `{ "Nachricht": "Hallo Leser!" }`
        var jsonMap map[string]string

        r := strings.NewReader(jsonBody)

        json.NewDecoder(r).Decode(&jsonMap)

        fmt.Println(jsonMap)
}