A handy TextInputFormatter that ensures adherence to the Canadian Postal Code Format.
In the pubspec.yaml of your flutter project, add the following dependency:
dependencies:
canada_postal_code_formatter: "^0.0.1"TextFormField(
inputFormatters: List<TextInputFormatter> [
LengthLimitingTextInputFormatter(7),
CanadaPostalCodeFormatter(),
],
),