Store settimeout id from nodejs in mongodb

I am running a web application using express and nodejs. I have a request to a particular endpoint in which I use settimeout to call a particular function repeatedly after varying time intervals.

For example

router.get ("/playback", function(req, res) {
    // Define callback here ...
    ....

    var timeoutone = settimeout(callback, 1000);
    var timeouttwo = settimeout(callback, 2000);
    var timeoutthree = settimeout(callback, 3000);
});

The settimeout function returns an object with a circular reference. When trying to save this into mongodb i get a stack_overflow error. My aim is to be able to save these objects returned by settimeout into the database.

I have another endpoint called cancel playback which when called, will retrieve these timeout objects and call cleartimeout passing them in as an argument. How do I go about saving these timeout objects to the database ? Or is there a better way of clearing the timeouts than having to save them to the database. Thanks in advance for any help provided.