IOS - ObjC - JSONString From NSString
NSString *myString = @"fr-FR"; // Or whatever
NSString *result = [NSString stringWithFormat:@"{"%@"}", myString];

theData = [[CJSONSerializer serializer] serializeObject:theString
                                                  error:&theError];

NSString *myString = @"fr-FR"; // Or whatever
NSString *result = [NSString stringWithFormat:@"{%@}", myString];
NSData* data=[result dataUsingEncoding:NSUTF8StringEncoding];

+ (id)JSONObjectWithData:(NSData *)data options:(NSJSONReadingOptions)opt error:(NSError **)error