To change the package name from com.myapp to: com.mycompany.myapp (for example),

1. For iOS app of the react app, use xcode - under general.

2. For the android app, open the build.gradle at module level. The one in the android/app folder. You will find

   ... defaultConfig { applicationId com.myapp ... } ...

Change the "com.myapp" to whatever you need.

Hope this helps.

To change the package name from com.myapp to: com.mycompany.myapp (for example),

1. For iOS app of the react app, use xcode - under general.
2. For the android app, open the build.gradle at module level. The one in the android/app folder. You will find

// ... defaultConfig { applicationId com.myapp // ... } // ... 

Change the com.myapp to whatever you need.

Hope this helps.