map.go

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	prof := map[string]interface{}{
		"name":   "Yamada Tarou",
		"age":    18,
		"height": 178.5,
	}

	profJson, _ := json.Marshal(prof)
	fmt.Println(string(profJson))
}