JADecomp 0.1.0

Java Archive Decompiler

JADecomp

JADecomp (Java Archive Decompiler) is a zero dependency Python tool for stripping apart .jar and .class files. It's built for speed and works entirely without a Java Runtime (JRE). If you need to peek inside a JAR without setting up a full Java environment, this is for you.

Why use this?

Most Java decompilers are written in Java, which means you need a JRE just to run the tool. JADecomp is pure Python. It parses the JVM binary format directly and reconstructs the class structure and method bytecode.

Installation

You can install JADecomp directly from PyPI:

pip install JADecomp

How to use it

The main command is jad. It handles single files or entire directories.

Decompile a single JAR

jad appserve.jar

This creates an appserve_decompiled folder with the source.

Bulk decompile a directory

If you have a folder full of Java libraries or legacy archives:

jad "C:\path\to\java\libs"

It will recursively find every .jar and .class file and decompile them into one output tree.

Custom output folder

jad appserve.jar -o ./out

How it works (The Tech)

JADecomp uses a custom native engine (engine.py) to map out the constant pool, fields, and methods of a class file.

Instead of just giving you empty method bodies, it disassembles the JVM bytecode into human readable opcodes (like invokevirtual, getstatic, ldc). This gives you a low level view of what the code is doing without needing the original source.

License

MIT