express - node.js connect-flash message does not show up -

i trying implement pretty basic error message login page trying build. code post request follows.

app.post('/login',function(req,res){   user.findone({username:req.body.user.username},function(err,info){   if(err){     req.flash('error','there error on our end. sorry that.');     res.redirect('/');   }    if(info==null){     req.flash('error', 'incorrect username. please try again, or make account');     res.redirect('/login');   }   else{     if(req.body.user.password==info.password){       res.redirect('/users/' + info.username);     }     else{       req.flash('error', 'incorrect password');       res.redirect('/login');     }   } }); }); 

i never see error message when trigger null case, although redirect occur. method route follows:

app.get('/login',function(req,res){    res.render('login',{      title: 'login'    }); }); 

you need pass flash messages template, , render them there:

app.get('/login',function(req,res){    res.render('login',{      title  : 'login',      errors : req.flash('error')    }); }); 

if you're using ejs templates (for example), check if errors contains value, , show it:

<% if (errors) { %>   <p class="error"><%= errors %></p> <% } %>