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# Decompile a Hermes React Native Binary

1. **Pull APK from device**

```bash
adb shell pm list packages | grep <app_name>
adb shell pm path <package_name>
adb pull /data/app/<package_name>-<random>/base.apk .
```

1. **Decompile APK resources**

   ```bash
   apktool d base.apk -o output_folder
   ```
2. **Locate React Native bundle**

   ```bash
   cd output_folder/assets/
   ls
   ```
3. **Check if Hermes bytecode**

   ```bash
   file index.android.bundle
   ```
4. **Get Hermes decompiler**

   ```bash
   git clone https://github.com/cognisys/hermes-dec.git
   cd hermes-dec
   pip3 install -r requirements.txt
   ```
5. **Disassemble Hermes bytecode**

   ```bash
   python3 hbc_disassembler.py ../index.android.bundle disasm_out
   ```
6. **Decompile to JavaScript**

   ```bash
   python3 hbc_decompiler.py ../index.android.bundle decompiled_out
   ```
7. **(Optional) Beautify/Deobfuscate JS**

   ```bash
   npx prettier --write decompiled_out/*.js
   ```


---

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