module-middleware-format.js

/**
 * Explain What Middleware/Route does.
 *
 * @author potanin@UD
 * @param req
 * @param res
 * @param next
 * @returns {*}
 */
function myMiddleware( req, res, next ) {
 
 // do stuff
 
 // call out helper method that is part of this module 
 module.exports.someHelperMethod( data, function someHelperMethodCallback( error, data ){
   
   // our someHelperMethod did some work, and now we can do res.send
   res.send( data );
   
 });

}

Object.defineProperties( module.exports = myMiddleware, {
  someHelperMethod: {
    /**
     * A method that is available externally and internally.
     *
     * module.exports.someHelperMethod( data, callback );    
     */
    value: function someHelperMethod( data, callback ) {

      // do something with data, trigger callback
      callback( null, {});

    },
     writable: true,
     enumerable: true
  }
});