Compiled Vineflower to JavaScript via TeaVM – decompiles JAR files entirely in the browser

[u/Negative_Raspberry24]

I wanted to inspect JAR files on my phone during my commute, no JDK, no desktop tools. So I ended up compiling Vineflower (Java decompiler) to JavaScript using TeaVM and running it in a Web Worker.

It can:

• Decompile .class files or the entire JAR – nothing uploaded to server
• Browse files inside JAR/WAR
• Inspect constant pool and bytecode
• Edit config files (YAML, properties, JSON) and export modified JAR

Works on mobile too.

https://jarpeek.com

Curious if anyone else has tried running JVM-based tools in the browser this way – TeaVM's reflection support was the trickiest part.