gistfile1.js

put(function(req, res) {
	    // Get our REST or form values. These rely on the "name" attributes
	    var email = req.body.email;
	    var password = req.body.password;
	    var servico = req.body.servico;

	    //find the document by ID
	    mongoose.model('Email').findById(req.id, function (err, email) {
	        //update it
	        email.update({
	            email : email,
	            password : password,
	            servico : servico
	        }, function (err, emailID) {
	          if (err) {
	              res.send("There was a problem updating the information to the database: " + err);
	          } 
	          else {
	                  //HTML responds by going back to the page or you can be fancy and create a new view that shows a success page.
	                  res.format({
	                      html: function(){
	                           res.redirect("/emails");
	                     },
	                     //JSON responds showing the updated values
	                    json: function(){
	                           res.json(email);
	                     }
	                  });
	           }
	        })
	    });
	})