Handling Timers For Many Users In Nodejs

I'm building a web app in Node/Express such that users can set a timer so that a certain task gets executed or repeated. My question is how can I set timer for many users with an e

Solution 1:

Your web app would have a more responsive UI and your backend would scale better if each client held its own timer. Closing the browser wouldn't be a problem.

• Persist the endtime in a DB in your server for the specific question.
• On the client side, retrieve the endtime from the server, and use JavaScript to create a timer that would alert the user their time has expired.
• On the server side, have an additional check that rejects answers if the answer is being submitted past endtime to prevent clients from cheating.