Extract JSON and save it in NSMutableArray - ios

Question

Following is the my JSON, and i want to extract the data and save it to a NSMutableArray. However, this doesn't get extracted accurately. I am stuck with this for awhile now. Can someone help me out ?
Note: I want the JSON to be extracted as it is. With each sub category.
{
"Animal":[
{
"Dog":[
{
"id":"644"
}
]
},
{
"Cat":[
{
"id":"4125"
},
{
"id":"1326"
}
]
},
{
"Mouse":[
{
"id":"224"
},
{
"id":"245"
}
]
},
{
"Fish":[
{
"id":"144"
},
{
"id":"142"
}
]
}
]
}
I need to add these components to a NSMutableArray. How can i do this ?
animalArray = [[NSMutableArray alloc] init];
for (int i =0; i < [[jsonDict objectForKey:#"Animal"] count]; i++) {
dictionary= [[NSMutableDictionary alloc] init];
for (int k =0; k < [[[jsonDict objectForKey:#"Animal"] objectAtIndex:i] count]; k++) {
dictionary setObject:[[[[jsonDict objectForKey:#"Animal"] objectAtIndex:i] objectAtIndex:k] objectForKey:#"id"] forKey:#"id"];
[animalArray addObject: dictionary];
}
}

Answer 1

Try this to get a NSDictionary object of exact structure that of the JSON
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData // this is your JSON
options:NSJSONReadingMutableContainers
error:&jsonError];
NSLog(#"%#",json); // check the structure here

Answer 2

I deep recommend use Mantle Library for parse JSON content:
Mantle Lib
And here a good introduction tutorial how use this lib:
How use mantle lib
You will see how easy is parsing and use data latter , and question please fell free for ask