react-native-nitro-store-country

⚡️ Lightning-fast store country detection for React Native using Nitro Modules

Get the user's App Store (iOS) or Google Play (Android) country code with a single call. Built with Nitro for maximum performance.

Features

• ⚡️ Lightning-fast - Built with Nitro Modules for maximum performance
• 🎯 Accurate - Gets store country from StoreKit (iOS) and Google Play Billing (Android)
• 💾 Fetch once - Queries store APIs once and saves the result
• 🔄 Force refresh - Option to refetch when needed
• 📱 System country - Access device locale country when store country is unavailable
• 🍎 [iOS] Auto-fallback - Automatically uses system country for non-App Store builds (TestFlight returns "USA")
• 🍎 [iOS] Alpha-2 codes - Converts StoreKit's alpha-3 codes to alpha-2 format
• ✨ TypeScript - Full type safety out of the box
• 🎨 Simple API - Just one method and one property

Installation

npm install react-native-nitro-store-country react-native-nitro-modules

yarn add react-native-nitro-store-country react-native-nitro-modules

bun add react-native-nitro-store-country react-native-nitro-modules

iOS

cd ios && pod install

Android

No additional steps required. The library uses autolinking.

Expo

Works with Expo Development Builds. You have two options:

Option 1: Using EAS (Expo Application Services)

npx expo install react-native-nitro-store-country react-native-nitro-modules
eas build --platform ios --profile development
# or
eas build --platform android --profile development

Option 2: Without EAS

npx expo install react-native-nitro-store-country react-native-nitro-modules expo-dev-client
npx expo run:ios
# or
npx expo run:android

Note: Not compatible with Expo Go (requires native code).

Usage

Basic Usage

import { StoreCountry } from 'react-native-nitro-store-country'

// Get store country (saves result after first call)
const storeCountry = await StoreCountry.getStoreCountry()
console.log(storeCountry) // "US", "GB", "DE", etc. or undefined

// Get device/system country (synchronous)
const systemCountry = StoreCountry.systemCountry
console.log(systemCountry) // "US", "GB", "DE", etc.

Force Refresh

// Force refetch when needed
const freshCountry = await StoreCountry.getStoreCountry(true)

React Hook Example

import { useEffect, useState } from 'react'
import { StoreCountry } from 'react-native-nitro-store-country'

const useStoreCountry = () => {
  const [country, setCountry] = useState(StoreCountry.systemCountry)

  useEffect(() => {
    StoreCountry.getStoreCountry().then(result => {
      // Update to store country if available, otherwise keep system country
      if (result !== undefined) {
        setCountry(result)
      }
    })
  }, [])

  return country
}

const App = () => {
  const country = useStoreCountry()

  return (
    <View>
      <Text>Country: {country ?? 'Unknown'}</Text>
    </View>
  )
}

API Reference

getStoreCountry(force?: boolean): Promise<string | undefined>

Gets the user's store country code (ISO 3166-1 alpha-2).

Parameters:

• force (optional): If true, forces a fresh fetch from the store API, ignoring any previously saved result. Default: false

Returns:

• Promise<string | undefined> - Two-letter country code (e.g., "US", "GB") or undefined if unavailable

Behavior:

• First call: Fetches from native store API (StoreKit/Google Play Billing)
• Subsequent calls: Returns saved result
• Saves undefined results to avoid repeated failed API calls
• Pass force: true to ignore saved result

systemCountry: string | undefined

The device's system locale country (synchronous, readonly).

Returns:

• string | undefined - Two-letter country code from device locale settings

Source:

• iOS: Locale.current.region?.identifier
• Android: Locale.getDefault().country

Platform-Specific Notes

iOS

• App Store builds: Returns accurate store country from StoreKit
• TestFlight/Debug/Simulator: Automatically falls back to systemCountry (StoreKit returns "USA" in these environments, so the library uses system locale instead)
• Alpha-3 to Alpha-2 conversion: Converts StoreKit's 3-letter country codes (e.g., "USA") to 2-letter ISO 3166-1 alpha-2 codes (e.g., "US") to match systemCountry format
• Automatic fallback: Only happens on iOS for non-App Store builds. On App Store, returns StoreKit's value directly

Android

• Uses Google Play Billing Library to fetch store country
• Returns undefined if:
  • Device doesn't have Google Play Services
  • User is not signed into Google Play
  • Billing client connection fails

Contributing

See the contributing guide to learn how to contribute to the repository.

License

MIT

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Made with ❤️ using Nitro Modules