circularJson.js

function JSONStringify(object) {
        var cache:any[] = [];
        var str = JSON.stringify(object,
            // custom replacer fxn - gets around "TypeError: Converting circular structure to JSON"
            function(key, value) {
                if (typeof value === 'object' && value !== null) {
                    if (cache.indexOf(value) !== -1) {
                        // Circular reference found, discard key
                        return;
                    }
                    // Store value in our collection
                    cache.push(value);
                }
                return value;
            }, 4);
        cache = [];
        return str;
    }