flash_messages.txt

1. npm install connect flash --save
2. go to app.js and add:
 flash       =      require("connect-flash");
 
 app.use(flash()); 
    
     //     AFTER PASSPORT CONFIG ONLY!!!   Creating a function that will check if there is a username/i.e is user loged in or not.
    app.use(function(req, res, next){
    res.locals.currentUser = req.user;// req.user will either be empty or contain information about user from the request
    res.locals.error = req.flash("error");
    res.locals.success = req.flash("success");
    next();  });