Q:- Can we check the server side validations are working or not there on the side from QA screen?
A:- Yes, there is a way to know server side validations are implemented or not on the developed site from QA system. This really should be known server side validations are implemented or not to halt unexpected request from users side with invalid information.
If Server side validations are not implemented in developed program then site owner may get unexpected data with invalid values and that situation will make a disturbed behavior to site administrator, so due to this a QA/Team should use techniques to be aware about implementation status.
Sharing an reference technique to know about server side validations are implemented or not, suppose a contact form is developed and sent it to testing team then tester or team should use a simple technique for stopping java script then further need to fill invalid data so now if proper server side validations are implemented then request will not submitted means it is cleared now server side validations are implemented or not.