title: Convert JSON feed to NSDictionary
body: <p>Where <code>JSON_CATEGORY_DATA_URL_STRING</code> is my feed URL, which returns fine as:</p>
  
  <pre><code>[
      {
          "group":"For Sale",
          "code":"SSSS"
      },
      {
          "group":"For Sale",
          "category":"Wanted",
          "code":"SWNT"
      }
  ]
  </code></pre>
  
  <p>I cannot seem to get a nice <code>NSDictionary</code> (or <code>NSArray</code>) out of the following code:</p>
  
  <pre><code>+ (NSDictionary *)downloadJSON
  {
  
  NSDictionary *json_string;
  NSString *dataURL = [NSString stringWithFormat:@"%@", JSON_CATEGORY_DATA_URL_STRING];
  NSLog(@"%@",dataURL);
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:dataURL]];    
  NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
  
  json_string = [[[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding]autorelease];
  NSDictionary *json_dict = (NSDictionary *)json_string;
  NSLog(@"json_dict\n%@",json_dict);
      NSLog(@"json_string\n%@",json_string);
  
  return json_string;
  }
  </code></pre>
  
  <p>I've read many posts on this, but am not getting it.</p>