Best way is validating from back end
You definitely have to validate in the backend for data consistency and security, because frontend validation can be disabled, but having validation in the frontend can significantly improve the user experience.
Thank you @mnrode for clarifying that
You actually have to validate both ways. That way you catch most of it on the frontend and leave the rare /edge cases to be handled by the backend.
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Best way is validating from back end
You definitely have to validate in the backend for data consistency and security, because frontend validation can be disabled, but having validation in the frontend can significantly improve the user experience.
Thank you @mnrode for clarifying that
You actually have to validate both ways. That way you catch most of it on the frontend and leave the rare /edge cases to be handled by the backend.