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How to detect cyclic json

Just use this snippet here

function isCyclic(obj) {
	var keys = [];
	var stack = [];
	var stackSet = new Set();
	var detected = false;

	function detect(obj, key) {
		if (obj && typeof obj != 'object') { return; }

		if (stackSet.has(obj)) { // it's cyclic! Print the object and its locations.
			var oldindex = stack.indexOf(obj);
			var l1 = keys.join('.') + '.' + key;
			var l2 = keys.slice(0, oldindex + 1).join('.');
			console.log('CIRCULAR: ' + l1 + ' = ' + l2 + ' = ' + obj);
			console.log(obj);
			detected = true;
			return;
		}

		keys.push(key);
		stack.push(obj);
		stackSet.add(obj);
		for (var k in obj) { //dive on the object's children
			if (Object.prototype.hasOwnProperty.call(obj, k)) { detect(obj[k], k); }
		}

		keys.pop();
		stack.pop();
		stackSet.delete(obj);
		return;
	}

	detect(obj, 'obj');
	return detected;
}

call with

isCyclic(json);

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