json marshal in go

json_marshal.go

package main


import (
	"fmt"
	"encoding/json"
)
 
type js struct { 
	A map[string]interface{}
	B interface{}
}

func jsonMarshal() (  []byte,   error){
	j := js{
		A: map[string]interface{}{
			"key": 3, 
			"values": map[string]interface{}{
				"key1": 3, 
				"key2": "value",
			},
		},
		B: map[string]interface{}{
		   	"key1": 41, 
			"key2": "value",
		},
	}
	
	return json.Marshal(j)
 
}

func main() {

        jss,_ := jsonMarshal()
	fmt.Printf("Hello, playground %q", jss)
}