JavaScript에서 중첩된 객체를 효과적으로 반복하려면 어떻게 해야 합니까?

var validation_messages = {
    "key_1": {
        "your_name": "jimmy",
        "your_msg": "hello world"
    },
    "key_2": {
        "your_name": "billy",
        "your_msg": "foo equals bar"
    }
};

for (var key in validation_messages) {
    // Skip loop if the property is from prototype
    if (!validation_messages.hasOwnProperty(key)) continue;

    // Access the nested member object
    var obj = validation_messages[key];
    
    for (var prop in obj) {
        // Skip loop if the property is from prototype
        if (!obj.hasOwnProperty(prop)) continue;

        // Access the individual properties
        alert(prop + " = " + obj[prop]);
    }
}