AngularJs displaying MongoDB data

i've a problem with the interact of AngularJs and MongoDb. I use NodeJs and ExpressJs on the server-side. With Mongoose i talk to Mongo. I've just done the routes.

index.js

      app.get('/api/dashboard', function (req, res) {

    Homepage
        .find({}, 'title -_id createdBy allbids.bid endTime')
        .exec(function (err, auctions) {
            if(err)
                res.send(err);
            console.log(auctions);
            res.json(auctions);
        })
});

The console display all the fields that i need.

Then i pass on the front-end. I use Angular route in this way:

       var app = angular.module('auction', [ 'ngRoute','HomeCtrl','NewAuctionCtrl', 'FollowingAuctionsCtrl', 'MyAuctionsCtrl']);


      app.config(function ($routeProvider, $locationProvider)
 {

 $routeProvider

.when('/', {
    templateUrl: 'views/partials/dashboard.html',
    controller: 'HomeController'
})



$locationProvider.html5Mode(true);


});

And my HomeController is this:

    angular.module('HomeCtrl', [])
  .controller('HomeController',function ($scope, $http) {
  $http.get('/api/dashboard').then(function(data) {
       console.log(data);
       $scope.auctions= data;

     })
  });

In the dashboard.html

         <div class="panel panel-default" ng-controller="HomeController">
<div class="panel-heading">All The Auctions</div>
<div class="panel-body">
    <ul class="list-group">
        <li class="list-group-item" ng-repeat="auction in HomeController.auctions">
            {{auction}}
        </li>
    </ul>
</div>

It doesn't work. I need only to use {{auction.title}} instead of {{auction}}??