my req.flash replacement for express

flash.coffee

module.exports = (req, res, next) ->

  # check for existence of deprecated `req.flash`
  if req.hasOwnProperty('flash') == true and typeof req.flash == 'object'

    res.locals.flash = req.flash

  if req.session.hasOwnProperty('messages') == true

    res.locals.flash = req.session.messages
    
    delete req.session.messages

  return next()

flash.js

module.exports = function (req, res, next) {

  // check for existence of deprecated `req.flash`
  if ((req.hasOwnProperty('flash')) && (typeof req.flash == 'object')) {
    res.locals.flash = req.flash;
  };
  
  if (req.session.hasOwnProperty('messages')) {
    res.locals.flash = req.session.messages;
    delete req.session.messages;
  };
  
  return next();

}

then you use it in your app.use block:

var flash = require('./pathTo/flash');
app.use(flash);