Question

I have a nested javascript object called data. Is there any way to iterate through it and find all properties that have the value undefined and set it to a string, “undefined” insted. JSON doesnt validate if the property value is undefined in IE7. Thanks

{
"Target": "System",
"Systemoperation": "Buy-In",
"Systemorigin": "ABB",
"Subscriptionmode": "Maintain & Evolve",
"Evolveto": "800xA",
"Quoteselection": "Full Quote",
"Commitmenttimeframe": "3 years",
"codevalues": {
    "Target": 100,
    "Systemoperation": 110,
    "Systemorigin": false,
    "Subscriptionmode": 4,
    "Evolveto": undefined,
    "Quoteselection": "fullquote",
    "Commitmenttimeframe": 3
},
"Route": [
    "System",
    "Buy-In",
    "ABB",
    "Maintain & Evolve",
    "800xA",
    "Full Quote",
    "3 years"
],
"currentsystem": ""

}

Here is evolteto in codevalues undefined. Which does not validate (try http://jsonlint.com/).

Answer 1

If this is your data structure (nested objs):

data = {
  a: undefined,
  b:{
    c: '1',
    d: undefined
  }
}

Then, this works for you

for (var items in data) {

  if (data[items] === undefined) {
    data[items] = 'undefined';
    continue;
  }
  for (var i in data[items]) {
    if (data[items][i] === undefined) {
      data[items][i] = 'undefined';
    }
  }
}