Example express error handler middleware snippet

middleware_example.js

  res.apiRespond = function(err, data) {
    if (err) {
      var code = (err.httpStatusCode || 500);
      if (code === 500) {
        logger.error('API error: ' + req.method + ' ' + req.originalUrl, err);
      }
      res.status(code).send(formatter.format(err));
    } else if (!data && req.method === 'GET') {
      res.notFound();
    } else {
      if (req.method === 'POST') {
        res.status(201);
      }

      sendResponse(req, res, data);
    }
  };