Framework

React Native

Read React Native JavaScript source code

Without Hermes engine

# 1. Dissasemble
apktool d <app_name>.apk

# 2. Change directory 
cd <app_name>/assets

# 3. Read index.android.bundle
cat index.android.bundle

# 4. Build and sign the apk

With Hermes engine

You need https://github.com/Kirlif/HBC-Tool

# 1. Dissasemble
apktool d <app_name>.apk

# 2. Verify Hermes bytecode and version
file <app_name>/assets/index.android.bundle

# 3. Disassemble index.android.bundle
hbctool disasm <app_name>/assets/index.android.bundle HASM

# 4. Edit the application’s instruction/strings

# 5. Assemble HASM
hbctool asm HASM <app_name>/assets/index.android.bundle

# 6. Build and sign the apk