var common = require('../common');

var inviteeSchema = common.Schema({
    email: String
});
var Invite = common.conn.model('Invite', inviteeSchema);
module.exports = Invite;

router.route('/addtoinvitelist').post(function (req, res, next) {

var invite =new Invite(req.body);

invite.save(function(err,email){
   if(err) throw err;

    res.json({message:"your mail id is stored in our database we will soon send you an invite"})
});
});

<form action="#">
                                            <div class="form-group">
                                                <label for="subcribeNewsletter" class="control-label">INVITE FORM<br> <small>We are happy to invite you to medicoshere, So please enter your email ID in the below form.</small></label>
                                                <div class="input-group input-group-in input-group-sm">
                                                    <div class="input-group-addon"><i class="fa fa-envelope text-belpet"></i></div>
                                                    <input class="form-control" id="subcribeNewsletter" placeholder="name@mail.com" ng-model="useremail" required>
                                                    <div class="input-group-btn">
                                                        <button type="submit" class="btn btn-default text-belpet" ng-click="AddToInviteList(useremail)"><strong>OK</strong></button>
                                                    </div>
                                                </div>
                                            </div><!-- /.form-group -->
                                        </form><!-- /form -->

$http({

        method: 'POST',
        url: "http://localhost:3000/users/addtoinvitelist",
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
        }, // set the headers so angular passing info as form data (not request payload)
        data:"email"

    }).success(function (data) {

        console.log("email is posted sucessfully" + data);
        cb(data);
    })

}`

App.controller('InviteController', function ($scope, $rootScope, $routeParams, $location, UserServices) {
$scope.init = function () {
    console.log("hii this is a test ")
};


$scope.email = {};

$scope.AddToInviteList = function () {

    UserServices.AddToInviteList($scope.email, function (dataresponse) {


        console.log(dataresponse);

    })

}