gistfile1.j

// create a JSON string from your NSDictionary
NSError *error; 
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:finalDict 
                                                   options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
                                                     error:&error];
NSString *jsonString = [[NSString alloc] init];
if (!jsonData) {
    NSLog(@"Got an error: %@", error);
} else {
    jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}