dataWithJSONObject: behavior changed in xcode 11?

Please share the cases where the behavior changes between Xcode 10 and 11.

This is what we have:

NSData *someData = data; // data here is not json compatiable
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:someData options:0 error:&error];

The above code works in xcode 10. But it will raise an exception at line 3 in xcode 11.

someData must not be a NSData. It can NSDictionary/ NSArray. If someData will not produce valid JSON, an exception is thrown. This exception is thrown prior to parsing and represents a programming error, not an internal error. You should check whether the input will produce valid JSON before calling this method by using isValidJSONObject:

Hope it helps.

Thanks for sharing. I tried your code with Xcode 9.4.1 and 10.1 with Command Line Tool project.

Xcode 9.4.1 -> Caused exception

Xcode 10.1 -> Caused exception

As already explained by kanishka_408, decides to throw an exception is the right behavior found both in Xcode 9.4.1 and 10.1.

There may be several versions of implementation of NSJSONSerialization, and you might have hit a buggy one in your Xcode 10 testing.

Or the example might not be the right one that would show different behavior.