gistfile1.js

function removeCircularReferences(obj) {
	debugger;
	var cache = [];

	var filter = function(obj, path) {
		return _.reduceRight(obj, function(memo, v, k) {
			if (typeof v === 'object' && v !== null) {
				var index = cache.indexOf(v);
				if (index !== -1) {
					memo[k] = '__circular__@' + index;
					return memo;
				} else {
					cache.push(v);
					memo[k] = filter(v);
					return memo;
				}
			} else {
				memo[k] = v;
				return memo;
			}
		});
	};

	return filter(obj);
}