angular posting to an MVC Web API problem

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MVC

AngularJs

Im trying to learn angular. I am currently in the stage of learning about $http requests to my MVC API.

EDIT: Slowly discovering the problem, it has something to do with the the pushing of the data from form into the array. the error message I am getting back is "TypeError: Converting circular structure to JSON"

I have a simple and I mean simple HTML form that allows me to collect 2 pieces of information and collect it into an Angularjs array and then pass it to the WEB API method.

But my main problem is that If I spell the parameter incorrectly if calls the method and the value of the input parameter is blank. If I spell the parameter correctly it doesn't call the method at all. any pointer to help me learn what is going on?

Thanks
Simon

<div ng-app="Demo">
  <div ng-controller="MyController">
    <input type="text" id="username" name="username" placeholder="name..." ng-model="user.name"/>
    <input type="text" id="otherdetails" name="otherdetails" placeholder="name..." ng-model="user.name"/>

    <button type="button" ng-click="Add(user)">Save</button>
    <button type="button" ng-click="SaveUsers()">Save To Web API</button>
  </div>
</div>

My Angular code is as follows

angular.module('Demo', []);
angular.modeul('Demo').controller('ButtonCtrl', function($scope, $http) {
  $scope.user = [];

  $scope.Add = function(user) {
    $scope.user.push(user);
  };

  $scope.SaveUsers = function() {
    var request = $http({
      method: "post",
      url: '/Home/Index',
      data: {user: $scope.user }
    });

    request.success(function() {
      alert('success');
    });

    request.error(function() {
      alter('failed');
    });
  };
};

My C# code

[HttpPost]
    public ActionResult Index(List<Person> user)
    {
        List<Models.Person> data = new List<Models.Person>();

        return null;
    }

    public class Person
    {
      public string Name {get;set;}
      public string Here {get;set;}
    }