Country Data Libraries: Technical Comparison for Frontend Developers

When building forms, internationalization systems, or global user interfaces, you'll need reliable country data. The six packages covered here — countries-and-timezones, countries-list, country-data, country-list, i18n-iso-countries, and iso-3166-1 — all serve this purpose but with different trade-offs in data coverage, API design, and maintenance status. Let's examine how they handle real-world scenarios.

📦 Data Coverage: What Information Each Package Provides

The first question when choosing a country library is simple: what data do you actually need?

countries-and-timezones combines country information with timezone data in one package.

import c from 'countries-and-timezones';

// Get country by code
const country = c.getCountry('US');
// { name: 'United States', code: 'US', timezones: ['America/New_York', ...] }

// Get all timezones for a country
const timezones = c.getCountriesTimezones('US');
// ['America/New_York', 'America/Chicago', 'America/Denver', ...]

countries-list provides country names, ISO codes, currencies, and phone codes.

import { countries } from 'countries-list';

// Access country by code
const country = countries.US;
// { name: 'United States', iso2: 'US', iso3: 'USA', currency: 'USD', phoneCode: '+1' }

// Iterate over all countries
Object.values(countries).forEach(country => {
  console.log(country.name, country.iso2);
});

country-data once offered comprehensive data including flags and regions, but is now unmaintained.

import countries from 'country-data';

// Get country by code
const country = countries.countries.US;
// { name: 'United States', alpha2: 'US', alpha3: 'USA', currency: 'USD' }

// Get currency info
const currency = countries.currencies.USD;
// { symbol: '$', name: 'US Dollar' }

country-list keeps things minimal with just codes and names.

import { getCode, getName, getNames } from 'country-list';

// Convert name to code
const code = getCode('United States');
// 'US'

// Convert code to name
const name = getName('US');
// 'United States'

// Get all countries as array
const allCountries = getNames();
// ['Afghanistan', 'Albania', ...]

i18n-iso-countries focuses on translations across many languages.

import countries from 'i18n-iso-countries';
import enLocale from 'i18n-iso-countries/langs/en.json';

// Register locale
countries.registerLocale(enLocale);

// Get country name in registered language
const name = countries.getName('US', 'en');
// 'United States'

// Get all country codes
const codes = countries.getCodes();
// ['AF', 'AL', 'DZ', ...]

iso-3166-1 provides strict ISO 3166-1 standard data only.

import { alpha2, alpha3, numeric } from 'iso-3166-1';

// Get country by alpha-2 code
const country = alpha2.get('US');
// { alpha2: 'US', alpha3: 'USA', numeric: '840', name: 'United States' }

// Get country by alpha-3 code
const country3 = alpha3.get('USA');
// { alpha2: 'US', alpha3: 'USA', numeric: '840', name: 'United States' }

🌍 Localization: Multi-Language Support Compared

For global applications, displaying country names in the user's language is often required.

countries-and-timezones has limited built-in translation support.

import c from 'countries-and-timezones';

// Primary names only - no built-in locale switching
const country = c.getCountry('DE');
// { name: 'Germany', ... } - always in English

countries-list provides names in English only.

import { countries } from 'countries-list';

// No locale parameter - names are fixed
const country = countries.FR;
// { name: 'France', ... } - English only

country-data includes some translations but is inconsistent.

import countries from 'country-data';

// Some translation support via translations property
const country = countries.countries.FR;
// { name: 'France', translations: { de: 'Frankreich', ... } }

country-list does not support translations.

import { getName } from 'country-list';

// Always returns English names
const name = getName('JP');
// 'Japan' - no locale option available

i18n-iso-countries excels with 100+ language packs available.

import countries from 'i18n-iso-countries';
import deLocale from 'i18n-iso-countries/langs/de.json';
import jaLocale from 'i18n-iso-countries/langs/ja.json';

countries.registerLocale(deLocale);
countries.registerLocale(jaLocale);

// Get name in different languages
const deName = countries.getName('DE', 'de');
// 'Deutschland'

const jaName = countries.getName('DE', 'ja');
// 'ドイツ'

iso-3166-1 provides standard names without translation focus.

import { alpha2 } from 'iso-3166-1';

// Standard ISO names only
const country = alpha2.get('FR');
// { name: 'France', ... } - no locale switching

🔧 API Design: How Developers Interact With Each Package

The way you access data affects code readability and maintenance.

countries-and-timezones uses a function-based API with getter methods.

import c from 'countries-and-timezones';

// Function calls for all operations
const country = c.getCountry('CA');
const allCountries = c.getCountries();
const timezones = c.getTimezones();
const byTimezone = c.getCountriesForTimezone('America/Toronto');

countries-list exports a plain object for direct property access.

import { countries } from 'countries-list';

// Direct object property access
const us = countries.US;
const uk = countries.GB;

// Iterate easily
for (const code in countries) {
  console.log(code, countries[code].name);
}

country-data uses nested objects with multiple data categories.

import countries from 'country-data';

// Nested structure for different data types
const country = countries.countries.US;
const currency = countries.currencies.USD;
const callingCode = countries.callingCodes['1'];

country-list provides utility functions for conversion.

import { getCode, getName, getNames, toAlpha3Code } from 'country-list';

// Conversion-focused API
const code = getCode('Canada');
const alpha3 = toAlpha3Code(code);
const all = getNames();

i18n-iso-countries requires locale registration before use.

import countries from 'i18n-iso-countries';
import enLocale from 'i18n-iso-countries/langs/en.json';

// Must register locale first
countries.registerLocale(enLocale);

// Then use translation methods
const name = countries.getName('BR', 'en');
const codes = countries.getCodes();
const allNames = countries.getNames('en');

iso-3166-1 separates data by ISO code type.

import { alpha2, alpha3, numeric, all } from 'iso-3166-1';

// Separate modules for each code type
const byAlpha2 = alpha2.get('MX');
const byAlpha3 = alpha3.get('MEX');
const byNumeric = numeric.get('484');
const allCountries = all.filter(c => c.alpha2);

⚠️ Maintenance Status: Which Packages Are Still Active

Package maintenance affects long-term project stability.

countries-and-timezones receives regular updates with timezone database refreshes.

// Actively maintained - timezone data stays current
import c from 'countries-and-timezones';

// Safe for production use
const country = c.getCountry('UA');
// Data reflects current geopolitical boundaries

countries-list has stable maintenance with occasional updates.

// Stable package - suitable for production
import { countries } from 'countries-list';

// Reliable for long-term projects
const country = countries.IN;

country-data is no longer actively maintained — avoid for new projects.

// ⚠️ DEPRECATED - Do not use in new projects
import countries from 'country-data';

// Consider alternatives like i18n-iso-countries instead
// Last significant update was several years ago

country-list remains stable with minimal changes needed.

// Stable and lightweight
import { getName } from 'country-list';

// Good for simple use cases that won't need frequent updates
const name = getName('AU');

i18n-iso-countries has active maintenance with regular locale updates.

// Actively maintained with community contributions
import countries from 'i18n-iso-countries';

// Safe choice for internationalized applications
const name = countries.getName('CN', 'zh');

iso-3166-1 follows ISO standard updates when published.

// Maintained to match ISO 3166-1 standard revisions
import { alpha2 } from 'iso-3166-1';

// Updates when ISO publishes changes
const country = alpha2.get('SS');

🎯 Real-World Use Cases: Which Package Fits Your Scenario

Scenario 1: Global E-Commerce Checkout Form

You need country selection with currency display in the user's language.

// ✅ Best choice: i18n-iso-countries
import countries from 'i18n-iso-countries';
import { countries as countryData } from 'countries-list';

countries.registerLocale(enLocale);
countries.registerLocale(esLocale);

function renderCountrySelect(userLocale) {
  return countries.getCodes().map(code => ({
    code,
    name: countries.getName(code, userLocale),
    currency: countryData[code]?.currency
  }));
}

Scenario 2: Meeting Scheduler with Timezone Selection

You need to show timezones available in each country.

// ✅ Best choice: countries-and-timezones
import c from 'countries-and-timezones';

function getTimezonesForCountry(countryCode) {
  return c.getCountriesTimezones(countryCode);
}

function getCountryForTimezone(timezone) {
  return c.getCountriesForTimezone(timezone);
}

// Render timezone dropdown based on selected country
const usTimezones = getTimezonesForCountry('US');
// ['America/New_York', 'America/Chicago', ...]

Scenario 3: Simple Country Dropdown

You need a basic country selector with minimal dependencies.

// ✅ Best choice: country-list
import { getNames, getCode } from 'country-list';

function renderSimpleSelect() {
  return getNames().map(name => ({
    label: name,
    value: getCode(name)
  }));
}

// Or use countries-list for more data
import { countries } from 'countries-list';

function renderWithCodes() {
  return Object.entries(countries).map(([code, data]) => ({
    label: data.name,
    value: code,
    phoneCode: data.phoneCode
  }));
}

Scenario 4: Data Validation and Normalization

You need to validate and convert country codes in backend services.

// ✅ Best choice: iso-3166-1
import { alpha2, alpha3 } from 'iso-3166-1';

function validateAndNormalize(input) {
  // Try alpha-2 first
  let country = alpha2.get(input.toUpperCase());
  
  // Fall back to alpha-3
  if (!country) {
    country = alpha3.get(input.toUpperCase());
  }
  
  return country ? country.alpha2 : null;
}

// Returns standardized alpha-2 code or null
const code = validateAndNormalize('USA');
// 'US'

📊 Feature Comparison Summary

💡 Key Takeaways for Decision Making

Pick countries-and-timezones when timezone handling is part of your core requirements. The combined data reduces dependency count and keeps timezone-country mappings consistent.

Pick countries-list for balanced features with currencies and phone codes. It's a solid middle ground for forms that need more than just names and codes.

Avoid country-data in new projects. The lack of active maintenance means outdated data and no TypeScript support. Migrate existing projects to i18n-iso-countries or countries-list.

Pick country-list for minimal needs. If you only need name-code conversion without extra metadata, this keeps your bundle small.

Pick i18n-iso-countries for multilingual applications. The translation support is unmatched and worth the extra bundle size for global products.

Pick iso-3166-1 for validation and normalization. When standards compliance matters more than user-facing features, this focused package delivers.

🔗 Combining Packages for Complex Needs

Sometimes one package isn't enough. Here's how to combine them safely:

// Example: i18n-iso-countries + countries-list for full coverage
import countries from 'i18n-iso-countries';
import { countries as countryData } from 'countries-list';
import enLocale from 'i18n-iso-countries/langs/en.json';

countries.registerLocale(enLocale);

function getCompleteCountryData(code, locale) {
  return {
    code,
    name: countries.getName(code, locale),
    currency: countryData[code]?.currency,
    phoneCode: countryData[code]?.phoneCode,
    iso3: countryData[code]?.iso3
  };
}

// Usage
const us = getCompleteCountryData('US', 'en');
// { code: 'US', name: 'United States', currency: 'USD', phoneCode: '+1', iso3: 'USA' }

🏁 Final Recommendation

For most frontend applications, start with countries-list for its balance of features and simplicity. Add i18n-iso-countries if you need translations. Reach for countries-and-timezones only when timezone data is a core requirement. Avoid country-data entirely for new work. Keep iso-3166-1 in mind for validation-heavy scenarios where standards matter most.