IOS How to get data from server with json

/* Get data from Server   */

+ (NSDictionary *)getDataFromJson:(NSString *)urlString {   

    // Execute search by performing an HTTP GET to the REST web service which returns JSON
    NSString *jsonString = [Global jsonFromURLString:urlString];

    //NSLog(@"jsonString: %@", jsonString);
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];

    // Parse JSON results with TouchJSON.  It converts it into a dictionary.
    CJSONDeserializer *jsonDeserializer = [CJSONDeserializer deserializer];
    NSError *error = nil;
    NSDictionary *resultsDictionary = [jsonDeserializer deserializeAsDictionary:jsonData error:&error];   
    if(error) return nil;
    return resultsDictionary;
  }
// Get json string from server 
+ (NSString *)jsonFromURLString:(NSString *)urlString {
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
   
    [request setTimeoutInterval:5.0];
    [request setHTTPMethod:@"GET"];
    NSURLResponse *response = nil;
    NSError *error = nil;
    NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    [request release];   
    if(error) {
       NSLog(@"Error:%@",error);
   } else {
       NSLog(@"Success");
   }
    NSString *resultString = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
    return [resultString autorelease];
}