Json DATA

json.m

NSDictionary *jsonDictionary = @{@"username":@"ok@free.fr", @"password":@"aaaaa"};
        NSError *error;
        NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:0 error:&error];
        if (!jsonData) {
            NSLog(@"JSON ERROR");
        } else {
            NSString *JSONString = [[NSString alloc] initWithBytes:[jsonData bytes] length:[jsonData length] encoding:NSUTF8StringEncoding];
            NSLog(@"JSON OUTPUT: %@",JSONString);
        }