Build on what you learn.
Guides for developers turning app behavior into a working API client.
How to turn an APK into a working API client
Find the calls your app makes, rebuild the request flow, and test the result outside Android.
Why captured app requests fail in your own client
A copied URL and token leave out the state that made the original request work.
Flutter API extraction: where to look in an APK
Flutter packages contain native runtime files and compiled Dart code. Follow the request flow beyond Java classes.
React Native API extraction: JavaScript, Hermes, and native calls
Trace the bundle and native modules together to rebuild the calls behind a React Native app.
Signed and encrypted API requests: what a working client needs
Recreate the request bytes, changing headers, and session context that the server accepts.
APK decompilation versus a working API client
Source-like output helps explain an app. A tested client turns that knowledge into calls you can use.
APK, XAPK, and split packages: upload the complete app
Missing splits can hide code, native libraries, and resources that your analysis needs.
Keep your API client working after an app update
Use build identity, request tests, and a small change log to find what changed.