@tarikkoc/national-id-validation

Validate national identification numbers (TCKN, DNI, PESEL, CPF, SSN* ) with checksum/format rules.
TypeScript types included. Zero dependency. Lightweight.
*SSN is format-only (no issuance database checks).

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Features

• ✅ TR – TCKN: official checksum rules (10th & 11th digits)
• ✅ ES – DNI: checksum letter ("TRWAGMYFPDXBNJZSQVHLCKE"[num % 23])
• ✅ PL – PESEL: checksum with weights [1,3,7,9,1,3,7,9,1,3] (rejects letters; allows spaces/hyphens)
• ✅ BR – CPF: two-stage check digits (10..2 then 11..2), rejects repeated-digit sequences
• ✅ US – SSN: format-only validation with blocked ranges (000, 666, 9xx; group=00; serial=0000)
• ✅ isValidNationalID(country, value) convenience switch
• 🧪 Test suite with Vitest
• 🧩 Zero dependencies

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Install

npm i @tarikkoc/national-id-validation
# yarn add @tarikkoc/national-id-validation
# pnpm add @tarikkoc/national-id-validation

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Usage

CommonJS

const {
  isValidTCKN,
  isValidDNI,
  isValidPESEL,
  isValidCPF,
  isValidSSN,
} = require("@tarikkoc/national-id-validation");

console.log(isValidTCKN("10000000146")); // true
console.log(isValidDNI("12345678Z")); // true
console.log(isValidPESEL("44051401458")); // true
console.log(isValidCPF("529.982.247-25")); // true
console.log(isValidSSN("123-45-6789")); // true (format-only)

ES Modules / TypeScript

import {
  isValidTCKN,
  isValidDNI,
  isValidPESEL,
  isValidCPF,
  isValidSSN,
} from "@tarikkoc/national-id-validation";

const ok = isValidTCKN("12345678Z"); // boolean

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API

• isValidTCKN(tckn: string): boolean
  11 digits; first digit must not be 0; 10th & 11th digits are checksums.

• isValidDNI(dni: string): boolean
NNNNNNNN-L (letter = "TRWAGMYFPDXBNJZSQVHLCKE"[num % 23]). Tolerates - and whitespace.

• isValidPESEL(pesel: string): boolean
  11 digits; check digit with weights [1,3,7,9,1,3,7,9,1,3]. Rejects non-digit chars (spaces/hyphens ignored).

• isValidCPF(cpf: string): boolean
  11 digits; two-stage check digits (10..2, then 11..2). Rejects repeated-digit sequences; dots/hyphens ignored.

• isValidSSN(ssn: string): boolean (format-only)
  Accepts AAA-GG-SSSS or 9 digits; rejects blocked ranges (000, 666, 9xx; group=00; serial=0000).

Disclaimer: This library validates format and checksum rules only. It does not confirm issuance/assignment by any authority.

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What’s new in 1.1.0

• Package renamed: @tarikkoc/check-tckn-num → @tarikkoc/national-id-validation
• New validators: ES (DNI), PL (PESEL), BR (CPF), US (SSN format)
• No breaking change for TCKN users — keep using isValidTCKN

Migration

- import { isValidTCKN } from "@tarikkoc/check-tckn-num";
+ import { isValidTCKN } from "@tarikkoc/national-id-validation";

(Optional) Deprecate the old package on npm:

npm deprecate @tarikkoc/check-tckn-num@"<1.1.0" "Renamed to @tarikkoc/national-id-validation"

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License

ISC © Tarik Koc