Make Whole Request UTF-8 from NSURLSession - objective-c

Question

I am making a simple NSURLSession GET request and i am returned the right data and i am able to serialize it up to one point where the data is no longer UTF-8 so i am unable to call keys of the children.
My data looks like this:
[
{
"GeoJsonData":"{\"type\":\"Feature\",\"properties\":{},\"geometry\":{\"type\":\"LineString\",\"coordinates\":[[-119.1968536376953,35.5229358991794],[-119.19696092605591,35.52019399894053],[-119.19206857681274,35.520141605030304],[-119.19204711914062,35.52003681710729],[-119.18736934661865,35.52007174643016],[-119.18730497360228,35.52213254957543],[-119.18839931488039,35.52215001378275],[-119.18842077255249,35.522813650845336],[-119.19696092605591,35.522918435143076]]}}",
"GeoJsonCenter":"{\"lat\":35.52148635814335,\"lng\":-119.1921329498291}"
},
{
"GeoJsonData":"{\"type\":\"Feature\",\"properties\":{},\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-112.42687225341795,33.49409462250672],[-112.42678642272949,33.47605511894646],[-112.42549896240234,33.47605511894646],[-112.42103576660156,33.48822503770075],[-112.41022109985352,33.49438093353938],[-112.42687225341795,33.49409462250672]]]}}",
"GeoJsonCenter":"{\"lat\":33.48521802624292,\"lng\":-112.41854667663574}"
}
]
As you can see there are alot of escape characters in there and i have 85 objects in this array i need to iterate over and once i get down to the children of these objects i am not able to call those objects.
example of my code:
NSMutableArray *geoJSONData = [[NSMutableArray alloc] init];
for (NSDictionary *item in jsonArray){
[geoJSONData addObject:[item objectForKey:#"GeoJsonData"]];
}
for (NSDictionary *item in geoJSONData) {
NSLog(#"%#", [item objectForKey:#"coordinates"]);
}
the last NSLog blows up the console because it is not able to find that key "coordinates" because it is wrapped with escaped characters and i need to get those out.
Has anyone ran into this issue and whats the best way to solve this so i can have my object working fully serialized as JSON.
any help is greatly appreciated, im just getting back into Objective-c from AngularJs and last time i worked with Objective-C i used NSUrlRequest...so things have changed.

Answer 1

If the data that you shown is the real representation of it then you have a small issue. The value for key GeoJsonData is not an object but a string. In other words it's an object that was serialized using JSON.stringify() and added to the parent object. Quite a strange construction, that's why I'm asking if that is the real JSON representation sent by the server.
What you'll need to do before trying to access the key coordinates is to JSON parse that string to get a valid object back so you can access it's properties as a normal NSDictionary, write now is just a string.
Just use NSJSONSerialization class to decode your GeoJsonData.