var app = angular.module('ssnApp', ['ssnMaskMod']);
app.controller('MainCtrl', function($scope) {
$scope.ssnval = '';
});
<!DOCTYPE html>
<html ng-app="ssnApp">
<head>
<script src="https://code.jquery.com/jquery.js"></script>
<script data-require="[email protected]" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.11/angular.min.js" data-semver="1.5.11"></script>
<script src="node_modules/jquery.maskedinput/src/jquery.maskedinput.js"></script>
<script src="node_modules/ssn-mask/ssn-mask.js"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
<input type="text" ng-model='ssnval' ssn-input >
<p>SSN {{ssnval}} !</p>
</body>
</html>