The answer
A caller can bypass browser controls and send a request directly. The server must independently verify field types, allowed values, lengths, and relevant business rules.
What validations should be applied to signup and login forms?
Why must signup validation run on the server when the form already validates input?
More FAQs in What validations should be applied to signup and login forms?
Do not trust a submitted privilege claim. Establish permitted roles through the application's approved account and invitation workflow, with authorization decisions enforced on the server.
Whitespace can be part of the original password. Changing submitted credentials can reject valid users or create inconsistent verification behavior between signup, login, and reset flows.
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