ObjectWeb ASM

ASM
Original authorEric Bruneton
DeveloperOW2
Initial release2002 (2002)
Stable release
9.7.1 / October 6, 2024 (2024-10-06)
Written inJava
Operating systemCross-platform
Typebytecode Engineering Library
LicenseBSD License
Websiteasm.ow2.io
Repository

The ASM library is a project of the OW2 consortium. It provides a simple API for decomposing, modifying, and recomposing binary Java classes (i.e. bytecode). The project was originally conceived and developed by Eric Bruneton. ASM is Java-centric at present, and does not currently have a backend that exposes other bytecode implementations (such as .NET bytecode, Python bytecode, etc.).

The name "ASM" is not an acronym: it is just a reference to the asm keyword of C, which allows some functions to be implemented in assembly language.