D3 Examples - JS Bin // source https://jsbin.com/kacowi

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
<script id="jsbin-javascript">
var myobj = {
    a: 90,
    b: undefined,
    c: {
        d: '909',
        e: {},
        f: undefined
    }
};
​
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>
​
​
​
<script id="jsbin-source-javascript" type="text/javascript">var myobj = {
    a: 90,
    b: undefined,
    c: {
        d: '909',
        e: {},
        f: undefined
    }
};
​
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></body>
</html>
    