node.js - PassportJS NodeJS Display Error Messages on page -

i using locomotivejs , passportjs auth on project, , found code online handle register:

   accountcontroller.create = function() {   var account = new account();   console.log("test");   account.email = this.param('email');   account.password = this.param('password');   account.name.first = this.param('first');   account.name.last = this.param('name.last');    var self = this;   account.save(function (err) {     if (err) {       console.log(err);        return self.redirect(self.urlfor({ action: 'new' }));     }     return self.redirect(self.urlfor({ action: 'login' }));   }); }; 

however cannot figure out how display error messages on page such "username exists" or "passwords not match" etc. can them console.log(). know how can this?

connect-flash pretty useful such situations:

// in app's config: var flash = require('connect-flash'); ... app.use(flash()); ...  // in #create controller: if (err) {   req.flash('error', 'your error message here');   return self.redirect(self.urlfor({ action: 'new' })); }  // in #new controller: res.render('template', { errors: req.flash('error') }); 

and in templates, check if errors exists (it's array) , render messages.