angular.toJson()

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.1/angular.min.js"></script>
<h1>angular.toJson()</h1>

JavaScript

var src = {
    name: 'Richard',
    likes: {
        fruit: [
            'apples', 'bananas', 'grapefruit']
    }
};

var json = angular.toJson(src, true);

console.log(json);

console.log(angular.isString(json));  //  true