controllerCert.js

/**
 * Created by mwmaleks on 29.10.13.
 */

var Certificate = require('../models/Certificate');
var path = "C:\\tmp\\testfile.txt";
var fs = require('fs');

function changeRonF(text) {
     return text.replace('R', 'N');
}

//пример асинхронного запроса к файлу
exports.index = function(req, res ) {
   
   fs.readFile(path, 'utf8', function (err, text) {
      if (err) 
          res.render('error', err);


      res.send(changeRonF(text));
   });

   res.send('white the file please');
};

exports.create = function(req, res ) {};