validating-forms
Form Validation Patterns
React 19 forms require validation on both client and server.
Client-Side Validation
Use HTML5 validation + custom logic:
<form action={submitForm}>
<input
name="email"
type="email"
required
pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$"
/>
<input
name="age"
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