This is a lightweight library which follows ISO-3166 standard to search needed information based on passing ISO 3166-1 alpha-2 country codes.
npm install --save node-country-info
var CountryInfo = require('node-country-info');
var info = CountryInfo.get('TW') // { name: 'Taiwan', alpha3: 'TWN', numeric: '158' }
Chia-Lung, Chen (EragonJ)
MIT