Config is returning an empty object {} despite correct setup in Android

[DhanushKG-25]

Description:

I am encountering an issue where Config from react-native-config is returning an empty object {}, even though the .env file and build configurations are properly set up. I have followed the documentation and verified all steps, but the issue persists.

---

Steps to Reproduce:

1. Installed react-native-config in my React Native project.
2. Created a .env file in the project root with the following content:

   APP_NAME=SampleApp
   PRODUCT_BUNDLE_IDENTIFIER=com.example.app
   PRODUCT_NAME=Sample Product
   APP_FOLDER=sample-folder

3. Added the following configuration in android/app/build.gradle:

   project.ext.envConfigFiles = [
       debugFlavor: ".env.sample-debug",
       releaseFlavor: ".env.sample-release"
   ]
   
   apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"

4. Built the app using:

   ./gradlew assembleDebugFlavor

5. Checked the Config object in JavaScript:

   import Config from 'react-native-config';
   console.log('Config:', Config); // Output: {}

---

Expected Behavior:

The Config object should contain the variables from the .env.sample-debug file, e.g.:

{
   APP_NAME: "SampleApp",
   PRODUCT_BUNDLE_IDENTIFIER: "com.example.app",
   PRODUCT_NAME: "Sample Product",
   APP_FOLDER: "sample-folder"
}

---

Actual Behavior:

The Config object is returning an empty object:

{}

---

Environment:

• react-native-config version: 1.5.3
• React Native version: 0.72.4
• Node version: 16
• Gradle version: 8.1.1
• Android Studio version: Ladybug
• Package Manager: [email protected]

---

Troubleshooting Steps Taken:

1. Verified that .env.sample-debug exists in the project root and has no formatting issues (e.g., no spaces around =).
2. Confirmed dotenv.gradle is being applied by adding a debug log:

   println("Using ENV_FILE: " + project.envConfigFiles[project.getProperty('ENVFILE')])

   Output showed the correct .env file is being used.
3. Checked BuildConfig in the decompiled APK. The variables from .env were not embedded in BuildConfig.
4. Restarted Metro with yarn start --reset-cache.
5. Updated to the latest compatible version of react-native-config.
6. Tried a minimal .env file (e.g., TEST_KEY=hello-world), but Config.TEST_KEY was still undefined.

---

Additional Notes:

• This issue occurs consistently for both debug and release builds.
• Using ./gradlew clean and rebuilding did not resolve the issue.
• I am unable to find the variables in BuildConfig after decompiling the APK.

[markpar]

I am experiencing this exact same issue! Works fine in iOS, but the Config object is undefined in Android.

[markpar]

@DhanushKG-25, I tried this solution, and it worked for me: #223 (comment).

[PriyanshuPandey-github]

I've similar issue I'm using react-native cli not expo. I was upgrading my app with the help of react-native-upgrade helper but whenever i switch the version from 0.73.11 to 0.74.0 the npx react-native config return "project": {"ios": null}" and it does not let me install pods saying undefined method for nil class in use_native_modules!

[nzcodarnoc]

The suggestions in this thread didn't resolve it for me (RN 0.76.5)

Here's my hack:

    const sourceEnv = Platform.select({
      ios: Config,
      android: {  
        ENV_VAR1: 'XXX',
        ENV_VAR2: 'true',
      },
      default: Config,
    });

God speed developers!

EDIT:
Obviously this is very bad practice because it means committing variables into the repo.

[VIPDodke]

The suggestions in this thread didn't resolve it for me (RN 0.76.5)

Here's my hack:

    const sourceEnv = Platform.select({
      ios: Config,
      android: {  
        ENV_VAR1: 'XXX',
        ENV_VAR2: 'true',
      },
      default: Config,
    });

God speed developers!

EDIT: Obviously this is very bad practice because it means committing variables into the repo.

A package in my project needs data from env file using react-native-config package. and I am getting the same empty object

[qbs-Jiju]

Ensure the following rules are in android/app/proguard-rules.pro

-keep public class **.BuildConfig { *; }

[amdrade]

Show error on log:

ReactNative: ReactConfig: Could not find BuildConfig class

[amdrade]

Changing the value of build_config_package to use the namespace value worked on Android for me.

Advanced Android Setup

namespace  "com.appflavors"

productFlavors {
        local {
            resValue "string", "app_name", "App Debug"
            resValue "string", "build_config_package", "com.appflavors"
            applicationIdSuffix ".debug"
            versionNameSuffix "-DEBUG"

        }

"dependencies": {
    "expo": "~52.0.27",
    "react-native": "0.76.6",
    "react-native-config": "^1.5.3"
  }