Error handling in NodeJS

bad_request.js

//sub object, filename = badrequest.js
var Exception = require('./exception')
 , inherits   = require('util').inherits;

function BadRequest(message, uiMessage){
  var code = 400;
  Exception.call(this, code, message, uiMessage);
}

inherits(BadRequest, Exception);

BadRequest.prototype.name = "BadRequest";

module.exports = BadRequest;

exception.js

//super object, filename exception.js
function HttpError(code, message){
  this.message = message;
  this.stack = new Error().stack;
  this.uiMessage = uiMessage;
  this.type = this.name;
  this.code = code;
}

HttpError.prototype = Object.create(Error.prototype);

HttpError.prototype.printStackTrace = function printStackTrace(){
  return this;
}

module.exports = HttpError;

some_service.js

var BadRequest = require('bad_request.js');


//useage, Application is constant object, contains ui related message
Promises.reject(new BadRequest(error.message, Application.ModuleName.usernameNotFound)