pl-registration-plate-validator

NPM package for validating user provided Polish registration plate. Works with registration plates issued after 2000 both regular (e.q. WZ 20000) and vanity (WO SIEMA).

In current version package exports a function of {valid, type, voivodeship, county, city} return that takes a string as an argument.

Installation

npm i "pl-registration-plate-validator"

Usage

ES6 / TypeScript

import {validatePlate} from "pl-registration-plate-validator";

const userInput = "WY 52322";
const processedPlate = validatePlate(userInput); // {valid: true, type: regular, voivodeship: mazowieckie, city: Warszawa, county: Wola}
const isPlateValid = processedPlate.valid; // true

ES5

var validePlate = require("pl-registration-plate-validator");
var processedPlate = validatePlate("WQ23003"); // {valid: false}
var isPlateValid = processedPlate.valid; // false

Results

If plate is a valid regular plate returned object is of type

{
    valid: true
    type: "regular"
    voivodeship: string
    county: string
    city: string
}

If it is a valid vanity plate, returned object is of type

{
    valid: true
    type: "vanity"
    voivodeship: string    
}

If it is not a valid plate, in both vanity and regular cases, returned object is of type

{
    valid: false 
}

Changelog

Version 1.0.0

Validation returns object with mandatory "valid" field.

If valid, return will look like

{
    valid: true,
    type: "regular",
    voivodeship: Lubelskie,
    county: Lublin, 
    city: Lublin
}

else

{
    valid: false
}

Version < 1.0.0

Validation returns boolean value.

Under the hood

Package runs a series of tests to determine whether a plate is valid or not. Currently, following conditions are taken into consideration:

• Start with stripping non letter/digit chars that might be provided alongside prefix, suffix pair (such as input of WU-12345)
• Return false at the very beginning if first char is not of A-Z (upperCased)
• Vanity or regular (Second char being a number while third a letter)
• Length of both types (regular 7-8, vanity 5-7)
• Prefix existence in provided JSON data files(both XY and XYZ prefixes)
• Vanity plate suffix can contain of no more than 2 digits, placed in two last chars.

Dev

1. git pull https://github.com/szwarckonrad/pl-registration-plate-validator.git
2. npm i -D
3. Scripts:
   • npm run build Builds with TSC to ES5 .js module
   • npm run test Fire ups Jest tests

TODO

1. Add description of tests module runs to determine whether the plate is valid or not.
2. ~~Add verbose mode that will return an object with detailed info on the plate.~~ v1.0.0