Hex

Validates that a value is a hexadecimal string — digits 0-9 and letters a-f only. Unlike hexColor, no # prefix is expected.

Configuration

Config flag	Type	Description
`hex`	`boolean`	When `true`, requires the value to be valid hexadecimal.

const form = useForm({
  initialValues: { value: '' },
  validationSchema: {
    value: { hex: true },
  },
});

import { V } from 'formify-js';

V.hex();

Scenario	Message
Non-hex characters present	`Must be valid hexadecimal`

Value	Result
`'1A2b3C'`	✅ Valid
`'deadbeef'`	✅ Valid
`'0xFF'`	❌ Invalid (`0x` prefix not allowed)
`'#fff'`	❌ Invalid (`#` not allowed)
`'hello'`	❌ Invalid (`l` and `o` are not hex digits)