label()

label($label) replaces the generated display name for a rule without changing the DTO property name or error key.

use Fynix\Rule;

$error = Rule::string('firstName')
    ->label('First name')
    ->min(2)
    ->validate('A');

The returned error uses First name in its message, while the field remains firstName in structured output. label() is immutable and returns a new rule.

Use labels for spaces, capitalization, abbreviations, or product language that should not be inferred from the property name.