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javascriptreact-nativeexpoip

How to get Wifi IP address from Expo when debugging on USB?

To detect the IP address our server is running on, I use the following code:

const localhostIP = Constants.linkingUri.split(':')[1].replace('//', '');

This works for testing via Wifi connections. It returns the Wifi address of my laptop.

However, when debugging on USB, I use:

npx expo start --localhost --android

Now this line of code returns 127.0.0.1 as address and I cannot use it as server address. The server runs on my laptop and needs to be called from its LAN IP address.

How do I retrieve the LAN IP address of my laptop from JavaScript using Expo and React Native?

I tried using the following packages:

react-native-network-info -> returns null
expo-network -> returns 0.0.0.0

Any help would be greatly appreciated

Solution

  • Fixed the issue by grabbing the IP Address from the console and adding it to an environmental variable

    https://docs.expo.dev/guides/environment-variables/