Depending on the package manager, add polish-utils to your project:

npm i -S polish-utils

or

yarn add polish-utils

I wrote this library because I needed a clean solution for extracting data and validating polish identification numbers such as PESEL or NIP.

This library is written in TypeScript and covered with tests.

PESEL is a class that accepts a PESEL string in a constructor

import { PESEL } from 'polish-utils'

const pesel = new PESEL('87111111111')

pesel.isValid // true
pesel.getGender() // "male"
pesel.getDateOfBirth() // Date object: Wed Nov 11 1987 00:00:00 GMT+0100 (Central European Standard Time)

NIP is a class that accepts a NIP string in a constructor

import { NIP } from 'polish-utils'

const nip1 = new NIP('7622654927')
const nip2 = new NIP('12-34-567-328')

nip1.isValid // true
nip2.isValid // true
nip1.getIssuingTaxOfficeCode() // "762"
nip2.getIssuingTaxOfficeCode() // "123"

Feel free to contribute to this repo. All you need to do is the following:

1. fork and checkout the repo
2. install dependencies

   yarn

3. develop (please adjust to the repo's code style 🙏)

   yarn lint 

4. write tests, run tests

   yarn test 

5. if you want to build the package, run

   yarn build