Both, client-side for UX, so the user gets direct feedback. And server-side to really validate/verify the data and prevent errors.
At least the API should have validation or users will exploit it sooner or later.
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Both, client-side for UX, so the user gets direct feedback. And server-side to really validate/verify the data and prevent errors.
At least the API should have validation or users will exploit it sooner or later.