JSON parsing using [NSJSONSerialization JSONObjectWithData:dataJson options:0 error:&error] thowing nil

error = Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Garbage at end.) UserInfo=0x7fa4e25da7c0 {NSDebugDescription=Garbage at end.}

If changing NSData to NSString , response is getting but using

id jsonData = [NSJSONSerialization JSONObjectWithData:dataJson options:0 error:&error]

showing above error, and response nil.

via Chebli Mohamed