country-from-postcode

A simple package that determines the country (England, Scotland, Wales, Northern Ireland, Channel Islands, Isle of Man) based on a UK postcode. No external dependencies.

Installation

npm install country-from-postcode

Usage

import { getCountryFromPostcode } from 'country-from-postcode';

const country = getCountryFromPostcode('SW1A 1AA');
console.log(country); // Outputs: "England"

The function getCountryFromPostcode returns one of the following country names:

• England
• Scotland
• Wales
• Northern Ireland
• Channel Islands
• Isle of Man
• “Invalid postcode” (if the postcode format is invalid)
• “Unknown postcode” (if the postcode does not match any known area or district)

Edge Cases

The package handles edge cases where postcodes span across borders:

• Dumfries and Galloway: Postcode DG1 maps to Scotland, but DG16 maps to England.
• Welsh Borders: Postcodes like SY1 (England) and SY10 (Wales) are handled correctly.

UK Postcode Format

UK postcodes follow a specific format:

• The outward code (before the space) consists of the area (1-2 letters) and the district (1-2 digits).
• The inward code (after the space) identifies more specific locations, such as a street.

For more detailed information on UK postcode formats, refer to:

• Doogal's postcodes
• ONS Postal geographies
• Wikipedia: UK Postcodes

License

This package is licensed under the WTFPL. Do what you want.