How to convert JSON serialized data to NSDictionary

Please Try the following Code.

NSError* error;NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData                                                     options:kNilOptions                                                        error:&error];NSArray* latestLoans = [json objectForKey:@"loans"];NSLog(@"loans: %@", latestLoans);

Just in case anyone is here to see swift code:

NSData to NSDictionary

let dictionary:NSDictionary = NSKeyedUnarchiver.unarchiveObjectWithData(jsonData)! as NSDictionary

NSData to NSString

let resstr = NSString(data: res, encoding: NSUTF8StringEncoding)

Check your json input, could it be that your root element is neither a dictionary nor an array? The documentation says you have to specify NSJSONReadingAllowFragments as the option in this case.

#import <Foundation/Foundation.h>int main(int argc, char *argv[]) {    NSAutoreleasePool *p = [[NSAutoreleasePool alloc] init];    NSData *jsonData = [@"{ \"key1\": \"value1\" }" dataUsingEncoding:NSUTF8StringEncoding];    NSDictionary *jsonObject=[NSJSONSerialization            JSONObjectWithData:jsonData                       options:NSJSONReadingMutableLeaves                         error:nil];    NSLog(@"jsonObject is %@",jsonObject);    [p release];}

Output:

2012-09-26 16:06:51.610 Untitled[19164:707] jsonObject is {    key1 = value1;}