idnumbers
    Preparing search index...

    The National Insurance Number of United Kingdom. This page is generated from the registry metadata of the library.

    Property Value
    Country code GBR, GB, UK
    ID type National Insurance Number
    Official name National Insurance Number (NINO)
    Also known as National Insurance Number; NINO
    Display format LL######L
    Input masks LL######L
    Length 9
    Example AB123456C
    Checksum no
    Checksum algorithm None (validated via prefix/suffix rules)
    Parsable no

    The root entry registers every country:

    import { validateNationalId } from 'idnumbers';

    validateNationalId('GBR', 'AB123456C').isValid; // true

    To bundle only this country, import its definition from idnumbers/countries/gbr and pass it to register():

    import { register, validateNationalId } from 'idnumbers/core';
    import { country } from 'idnumbers/countries/gbr';

    register(country);
    validateNationalId('GBR', 'AB123456C').isValid; // true