stdnum
Version:
Standard Number Validation
62 lines • 4.96 kB
JavaScript
import * as exceptions from '../exceptions';
import { strings } from '../util';
function clean(input) {
return strings.cleanUnicode(input, ' -.');
}
function validLength(value) {
return [8, 9].includes(value.length);
}
function isValidPrefix(prefix) {
const invalidChars = ["D", "F", "I", "Q", "U", "V"];
const invalidSecondChar = "O";
const invalidPrefixes = ["BG", "GB", "KN", "NK", "NT", "TN", "ZZ"];
if (invalidChars.includes(prefix[0]) || invalidChars.includes(prefix[1])) {
return false;
}
if (prefix[1] === invalidSecondChar) {
return false;
}
return !invalidPrefixes.includes(prefix);
}
const VALID_FORMAT_REGEX = /^([A-Z]{2})\d{6}[A-D]?$/;
function validFormat(value) {
const matchData = value.toUpperCase().match(VALID_FORMAT_REGEX);
const prefix = value.slice(0, 2).toUpperCase();
return !!matchData && isValidPrefix(prefix);
}
const impl = {
name: 'United Kingdom National Insurance Number',
localName: 'National Insurance Number',
abbreviation: 'NINO',
compact(input) {
const [value, err] = clean(input);
if (err) {
throw err;
}
return value;
},
format(input) {
const [value] = clean(input);
return value;
},
validate(input) {
const [value, error] = clean(input);
if (error) {
return { isValid: false, error };
}
if (!validLength(value)) {
return { isValid: false, error: new exceptions.InvalidLength() };
}
if (!validFormat(value)) {
return { isValid: false, error: new exceptions.InvalidFormat() };
}
return {
isValid: true,
compact: value,
isIndividual: true,
isCompany: false,
};
},
};
export const { name, localName, abbreviation, validate, format, compact } = impl;
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