Steps Required
1.Download the library from the above link.
2.In your project Drag and drop the JSON folder from the downloaded folder.Check the option copy folders.
3.Import JSON.h to the file where you want to do the json parsing.
Now for the parsing its fairly simple
If your json Format is an object then you can parse directly
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *results = [jsonString JSONValue];
NSString *studentsAge=[results objectForKey:@"age"];
Depending on your object you have to adjust the result variable data type and You were done.