<form action="/" method="post">
  <input type"email" name="email" />
  <input type"password" name="password" />
  <input type="submit" value="login" />
</form>

<form >
  <input type"email" ng-model="user.email" />
  <input type"password" ng-model="user.password" />
  <button ng-click="login">login</button>
</form>

$scope.user = {};
$scope.login= function () {
   $http({
      url: 'http://localhost:3000/',
      method: 'POST',
      data: {
        email: user.email,
        password:user.password
      }
   });
});

router.post('/', function (req, res, next) {
  console.log(req.body);
  //custom authentication or use passport.js
});