How to build smarter auth form validation using React, TanStack Form, and Zod

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Most email and password login forms frustrate users by showing validation errors either too early or too late, often before a field is touched or only after submission. A developer writing for DEV Community proposes a 'reward early, punish late' approach to fix this UX problem. The method delays error creation until the user has actually typed something, then clears the error immediately once they begin correcting their input. The technique is implemented using React, TanStack Form 1.x, Zod, and a custom validation logic function called rewardEarlyPunishLate. TanStack Form's onDynamic validator makes it possible to control exactly when an error is born, displayed, and dismissed independently of one another.

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