Do u have to take the JLPT exams? Or is it a thing for gauging ur lvl of skill?
Only if 'HAVE to' means 'definitely should'. It is important to some employers, but not all. If you can demonstrate your ability (at that level) without the test it likely won't be an issue.
That being said, it is MUCH better to have the certificate and not need it than to need it and not have it.