How do I detect if the app uses React Native, given APK file?

Question

I downloaded APK file from Google Play, and want to know if the develop of the application have used React Native library. What's a quick and stable way to do that? (Would be even better if it's something I can potentially automate later - but such automation itself is out of scope of this question.)

Answer 1

I can offer you 2 solutions:

• Solution 1

You can use dex2jar. When you open the generated jar file, you can check if it uses React Native if there is a folder /com/facebook/react/.

• Solution 2

  1. Rename your application APK app.apk into app.zip
  2. Decompress your zip file
  3. Use dexdump from AndroidSDK$ANDROID_HOME/build-tools//dexdump:dexdump classes.dex`
  4. Search for com/facebook/react in the output of dexdump