structure for writing module/api in node

node-file-structure.js

/**
 * Module dependencies.
 */

var http = require('http');               // native modules first
var mongoose = require('mongoose');       // npm modules second
var config = require('config');           // modules that are required via NODE_PATH third
var fmt = require('./format-date');       // local modules fourth
var oauth = require('../../oauth');       // relative modules last

/**
 * Expose
 */

module.exports = Main;

/**
 * main
 *
 * @param {Object} options 
 */

function Main (options) {
  // body...
}

/**
 * fetch
 *
 * @param {Object} item 
 * @param {Function} cb 
 * @return {Main} 
 */

Main.prototype.fetch = function (item, cb) {
  // body...
};
                                            // exports
/**
 * perform
 *
 * @param {Request} req 
 * @param {Response} res 
 */

exports.fetch = function (req, res) {
  // body
};
                                            // private functions  
/**
 * request
 *
 * @param {Object} options 
 * @param {Function} cb 
 */

function request (options, cb) {
  // body...
}