Expressjs passing locals with route.render

Console log show me the active user, but I cannot use it in view, I am using plain html.

app.post('/',  function (req, res) {
   var user = { user : req.body.username };
   res.render('doctor_hagfish/pets',  { locals:{
   user:user
   }});
   console.log(user)
});

I don't know what i am doing wrong, suggestions? Until now i tried these syntaxes in view #{user} {{user}}