gistfile1.txt

function fetchJSON( url ) {
  var request = NSMutableURLRequest.new();
  [request setHTTPMethod:@"GET"];
  [request setURL:[NSURL URLWithString:url]];

  var error = NSError.new();
  var responseCode = null;

  var oResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:responseCode error:error];

  var dataString = [[NSString alloc] initWithData:oResponseData encoding:NSUTF8StringEncoding];

  return JSON.parse( dataString );
}
fetchJSON('api.open-notify.org/astros.json');