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DocumentationAPI ReferencePostal Code

Postal Code API

Validate postal codes for 150+ countries with local terminology support. Available as postalCode from the main bundle, with convenience aliases zipCode, pinCode, and postcode.

import { postalCode } from '@koshmoney/countries';
 
// Aliases (all equivalent)
import { zipCode } from '@koshmoney/countries';   // US terminology
import { pinCode } from '@koshmoney/countries';   // India terminology
import { postcode } from '@koshmoney/countries';  // UK/AU terminology

Types

interface PostalCodeInfo {
  regex: RegExp;   // Validation pattern
  format: string;  // "NNNNN" or "A1A 1A1"
  name: string;    // "ZIP Code", "PIN Code", "Postcode"
}

Validation

isValid(countryCode, code)

Validate a postal code for a given country. Lenient — accepts common variations like missing spaces, lowercase, and extended formats (e.g., ZIP+4).

Parameters:

  • countryCode: string — Alpha-2 country code
  • code: string — Postal code to validate

Returns: boolean

import { postalCode } from '@koshmoney/countries';
 
// United States
postalCode.isValid('US', '90210');       // true
postalCode.isValid('US', '90210-1234');  // true (ZIP+4)
 
// United Kingdom
postalCode.isValid('GB', 'SW1A 1AA');   // true
postalCode.isValid('GB', 'sw1a1aa');    // true (case-insensitive, no space)
 
// India
postalCode.isValid('IN', '110001');     // true
 
// Canada
postalCode.isValid('CA', 'K1A 0B1');   // true
 
// Germany
postalCode.isValid('DE', '10115');     // true
 
// Japan
postalCode.isValid('JP', '100-0001');  // true
 
// Invalid
postalCode.isValid('US', 'ABCDE');    // false
postalCode.isValid('XX', '12345');    // false (unknown country)

Information

getName(countryCode)

Get the local terminology for postal codes in a given country.

Parameters: countryCode: string Returns: string | null

import { postalCode } from '@koshmoney/countries';
 
postalCode.getName('US');  // 'ZIP Code'
postalCode.getName('IN');  // 'PIN Code'
postalCode.getName('GB');  // 'Postcode'
postalCode.getName('DE');  // 'PLZ'
postalCode.getName('BR');  // 'CEP'
postalCode.getName('JP');  // '郵便番号'
postalCode.getName('KR');  // '우편번호'
postalCode.getName('FR');  // 'Code postal'

getFormat(countryCode)

Get the human-readable postal code format for a country.

Parameters: countryCode: string Returns: string | null

import { postalCode } from '@koshmoney/countries';
 
postalCode.getFormat('US');  // 'NNNNN or NNNNN-NNNN'
postalCode.getFormat('GB');  // 'AA9A 9AA'
postalCode.getFormat('CA');  // 'A1A 1A1'
postalCode.getFormat('DE');  // 'NNNNN'

getPattern(countryCode)

Get the regex pattern used for validation.

Parameters: countryCode: string Returns: RegExp | null

import { postalCode } from '@koshmoney/countries';
 
postalCode.getPattern('US');  // /^\d{5}(-\d{4})?$/
postalCode.getPattern('GB');  // RegExp for UK postcodes

getInfo(countryCode)

Get full postal code information for a country.

Parameters: countryCode: string Returns: PostalCodeInfo | null

import { postalCode } from '@koshmoney/countries';
 
postalCode.getInfo('US');
// {
//   regex: /^\d{5}(-\d{4})?$/,
//   format: 'NNNNN or NNNNN-NNNN',
//   name: 'ZIP Code'
// }
 
postalCode.getInfo('XX');
// null

hasPostalCode(countryCode)

Check if a country uses postal codes at all.

Parameters: countryCode: string Returns: boolean

import { postalCode } from '@koshmoney/countries';
 
postalCode.hasPostalCode('US');  // true
postalCode.hasPostalCode('HK');  // false (Hong Kong has no postal codes)
postalCode.hasPostalCode('AE');  // false (UAE has no postal codes)
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