JS Bin // source https://jsbin.com/kacowi

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

const isRealObj = (obj) => {
 return obj && typeof obj == 'object' && obj !== null && obj !== 'undefined';
}
// loop through the item

const sanitizeKey = (obj, key) => {
	if (typeof obj[key] == 'undefined') obj[key] = null;
	
	if (isRealObj(obj[key])) {
		// loop through it 
		Object.keys(obj[key]).forEach(val => sanitizeKey(obj[key], val));
	}
}

const sanitizer = (obj) => {
	Object.keys(obj).forEach(key => sanitizeKey(obj, key));
	return obj;
}

var ok = sanitizer(myobj);
console.log(ok);
</script>

const isRealObj = (obj) => {
 return obj && typeof obj == 'object' && obj !== null && obj !== 'undefined';
}
// loop through the item

const sanitizer = (obj) => {
	Object.keys(obj).forEach(key => sanitizeKey(obj, key));
	return obj;
}

var ok = sanitizer(myobj);
console.log(ok);

</script></body>
</html>