Validation

Built-in validators on presets or your own function; wired to React Hook Form errors.

Built-in validators

Enable with validate: true and a validator key. Empty fields are not validated.

Key	Usage
`luhn`	Card number (Amex 15 / others 16 digits)
`expiry`	MMYY: month 1–12, not a past date
`tckn`	11-digit Turkish ID algorithm
`vkn`	10-digit tax ID number
`iban`	TR + 24 digits, mod-97
`email`	Email regex
`url`	URL regex
`date`	Calendar date (with `dateFormat`)

Functions can also be imported directly: validateLuhn, validateTCKN, validateIBAN, the VALIDATORS map, etc.

{
  mask: "(999) 999 99 99",
  validate: true,
  validator: (value) => value.length === 10,
}

On failed validation, errorMessage is returned; otherwise RHF gets false. Read errors from form.formState.errors.

For type definitions see types; for live examples see examples.

Built-in validators on presets or your own function; wired to React Hook Form errors.

Enable with validate: true and a validator key. Empty fields are not validated.

Key	Usage
`luhn`	Card number (Amex 15 / others 16 digits)
`expiry`	MMYY: month 1–12, not a past date
`tckn`	11-digit Turkish ID algorithm
`vkn`	10-digit tax ID number
`iban`	TR + 24 digits, mod-97
`email`	Email regex
`url`	URL regex
`date`	Calendar date (with `dateFormat`)

Functions can also be imported directly: validateLuhn, validateTCKN, validateIBAN, the VALIDATORS map, etc.

{
  mask: "(999) 999 99 99",
  validate: true,
  validator: (value) => value.length === 10,
}

On failed validation, errorMessage is returned; otherwise RHF gets false. Read errors from form.formState.errors.

For type definitions see types; for live examples see examples.