controllers-main.js

function MainController(model) {
    this.model = model;
}
MainController.prototype = {
    findAll: function (req, res) {
        res.send(200, this.model + '.find({})');
    },
    findById: function (req, res) {
        res.send(200, this.model + '.findById(req.params.id)');
    },
    create: function (req, res) {
        res.send(200, 'new ' + this.model + '(req.body)');
    },
    update: function (req, res) {
        res.send(200, this.model + 'findByIdAndUpdate')
    }
};

module.exports = MainController;

controllers-user.js

var MainController = require('./main');

var UserController = function () {
    UserController.super_.apply(this, 'User');
};

UserController.prototype = {
    checkAuth: function (req, res, next) {
        if (req.session.user) {
            res.json({login: req.session.user});
        } else {
            next();
        }
    },

    login: function (req, res, next) {
        var mail = req.body.mail;
        var password = req.body.password;
        User.authorize(mail, password, function (err, result, user) {
            if (result.login == 'yes') {
                req.session.user = user._id;
                res.json(result);
            } else {
                res.json({login: "no"});
            }
        })
    }
};

util.inherits(UserController, MainController);
module.exports = UserController;

index.js

var express = require('express');

var app = express();

var UserController = require('./controllers/user');
var userController = new UserController();

app.get('/users', userController.findAll.bind(userController));