function stringifyCyclicJSON(sourceObject, maxDepth = 5)
{
	var knownObjects = {};
	var jsonString = '';
	recStringifyObject(sourceObject, '', 1, 'root');
	return jsonString;
	
	function recStringifyObject(currentObject, indent, level, path)
	{
		var isArray = (currentObject instanceof Array);
		var subIndent = indent + '\t';
		var i = 0;
		jsonString += (isArray ? '[' : '{');
		if (isArray)
		{
			for (; i < currentObject.length; i++)
			{
				doSingleStringify(i, '');
			}
		}
		else
		{
			for (var key in currentObject)
			{
				if (currentObject[key] !== undefined)
				{
					doSingleStringify(key, '"' + key + '": ');
					i++;
				}
			}
		}
		jsonString += (i > 0 ? '\n' + indent : ' ') + (isArray ? ']' : '}');
		
		function doSingleStringify(key, addBefore)
		{
			var value = currentObject[key];
			jsonString += '\n'
				+ subIndent
				+ (i > 0 ? ', ' : '')
				+ addBefore;
			if (typeof value == 'object')
			{
				// first search in known Objects
				var found = false;
				for (var pathKey in knownObjects)
				{
					if (knownObjects[pathKey] == value)
					{
						jsonString += '"[' + pathKey + ']"';
						found = true;
					}
				}
				if (!found)
				{
					var newPath = path + (isArray ? '[' + key + ']' : '.' + key);
					knownObjects[newPath] = value;
					if (level < maxDepth)
					{
						recStringifyObject(value, subIndent, level + 1, newPath);
					}
					else
					{
						jsonString += '"[' + (value instanceof Array ? 'Array' : 'Object') + ']"';
					}
				}
			}
			else if (typeof value == 'function')
			{
				jsonString += '"[Function]"';
			}
			else
			{
				jsonString += JSON.stringify(value);
			}
		}
	}
}