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This is seriously impressive! Really like the clear layout, maybe a bit too large text everywhere, but I guess that's just a my preferences :).

How did you make sure the application is secure? XSS/SQL Injection?

Thank you! I have some experience with web security as I participate in a couple bug bounty programs, and I know the common mistakes to avoid.

Nothing is perfect, so if you find anything please let me know at varun@quickz.org :)

another class of security issues that has been seen in other quiz apps is client-side disclosure of questions/answers, e.g., https://mentimeter.canny.io/feature-requests/p/make-sure-que...

I've definitely had some fun in class with websites that do too much client side logic. ;)

I made sure to do all the important calculations server side, and only send the necessary data to clients.