We've all been there.
this post was submitted on 14 Jul 2023
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I'll keep my aswer short, but first of all, usually this format enforcement is done on the client before it is ever sent to the backend, there are many reasons to limit the maximum length other than string length limitations on the database ( not that I can think of many actual good reasons).
Second of all, the client should send the actual password to the backend (allowing you validate these same password requirements on your backend), not the hashed password, hashing the password on the client side would be no better than storing the password as "plain text".
And never is the "plain text" password stored in any database, only sent over to the backend and hashed, every time you set a new password, or log in using an existing one.