> For the complete documentation index, see [llms.txt](https://mobile.mrw0l05zyn.cl/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mobile.mrw0l05zyn.cl/android/analisis-estatico/reversing/aplicaciones-hibridas/react-native.md).

# React Native

## General

Al desarrollar una aplicación con React Native, la mayor parte de la lógica se implementa en JavaScript. El proyecto también incluye clases nativas como MainActivity, escritas en Java o Kotlin, que actúan como punto de entrada en la plataforma Android. Cuando la aplicación está lista para su publicación, el código JavaScript se empaqueta en un archivo optimizado y minificado llamado `index.android.bundle`, lo que mejora el rendimiento y reduce el tamaño total de la aplicación.

* `APK -> Resources-> assets-> index.android.bundle`

## Lectura de código JavaScript minificado

```sh
apktool d application.apk -o app-decompiled

file app-decompiled/assets/index.android.bundle
app-decompiled/assets/index.android.bundle: React Native minified JavaScript, ASCII text

js-beautify app-decompiled/assets/index.android.bundle > output.js
```

## Lectura de código JavaScript compilado (Hermes)

```sh
apktool d application.apk -o app-decompiled

file app-decompiled/assets/index.android.bundle
app-decompiled/assets/index.android.bundle: Hermes JavaScript bytecode

# hermes-dec
./hbc_decompiler.py app-decompiled/assets/index.android.bundle output.js
```

## Herramientas

* [js-beautify](https://github.com/beautifier/js-beautify)
* [hermes-dec](https://github.com/P1sec/hermes-dec)


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