ModsFinder

SpASM

by mine_diver

SpASM is a Fabric library for registering bytecode transformers that act on classes without requiring their exact names.

FabricClient or server, optionalMIT LicenseOpen sourcerd-132211 – 1.20.1

What it does

Mod developers use SpASM to register class transformers, which change Java classes at load time through ASM bytecode editing. Because a transformer can select its targets by pattern rather than by listing each class name, a single transformer can reach many classes. The library is published for Fabric only, for game versions rd-132211 – 1.20.1, and its latest file is 0.2.2 for 1.20.1.

Key features

  1. Pattern-based class selection

    Transformers can match classes dynamically across the codebase, so the author does not need to name each target.

  2. Pure ASM approach

    The library is built directly on ASM, with no additional bytecode framework layered on top of it.

  3. Transformer registration API

    Transformers are registered through the ClassTransformer interface in the net.minecraft.spasm API package.

Compatibility

Latest build for each game version and loader.

1.20.x2 of 2 versions with builds
1.20.10.2.2
1.200.2.2
1.19.x5 of 5 versions with builds
1.19.40.2.2
1.19.30.2.2
1.19.20.2.2
1.19.10.2.2
1.190.2.2
1.18.x3 of 3 versions with builds
1.18.20.2.2
1.18.10.2.2
1.180.2.2
1.17.x2 of 2 versions with builds
1.17.10.2.2
1.170.2.2
1.16.x6 of 6 versions with builds
1.15.x3 of 3 versions with builds
1.14.x5 of 5 versions with builds
1.13.x3 of 3 versions with builds
1.12.x3 of 3 versions with builds
1.11.x3 of 3 versions with builds
1.10.x3 of 3 versions with builds
1.9.x5 of 5 versions with builds
1.8.x5 of 5 versions with builds
ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

33 older game versions (1.0 – 1.8.4) not shown. All files on Modrinth

Questions

Does SpASM need to be installed on both sides?

No. It works on either side, and neither the client nor the server needs it.

In the catalog

SpASM is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 34,764 mods support Minecraft 1.20.1.

Library mods3,514Fabric modsMods for 1.20.134,764

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Similar mods

Fabric API1.14 – 26.3Cloth Config API1.14 – 26.3YetAnotherConfigLib (YACL)1.19 – 26.3Architectury API1.16.5 – 26.3Just Enough Items (JEI)1.8 – 26.3Geckolib1.12.2 – 26.3

What the author says

Allows registering class transformers that process all classes, without specifying the class's names like in FabricASM. Interface - net.mine_diver.spasm.api.transform.ClassTransformer
mine_diver, on the Modrinth page

Official listing

Owner
mine_diver
Published
2023-06-24
Updated on Modrinth
2023-09-05
Facts verified
2026-10-15

Tags

Library
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