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    // map data
    mapData := map[string]interface{}{
        "Name": "noknow",
        "Age": 2,
        "Admin": true,
        "Hobbies": []string{"IT","Travel"},
        "Address": map[string]interface{}{
            "PostalCode": 1111,
            "Country": "Japan",
        },
        "Null": nil,
    }

    // Convert map to json string
    jsonStr, err := json.Marshal(mapData)
    if err != nil {
        fmt.Println(err)
    }