- Loaders
- FabricQuilt
- Downloads on Modrinth
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- Followers on Modrinth
- 5
- versions
- 18
- Updated
- September 19, 2026Sep 19
- Published
- in 2023
At a glance
Install in the game only; not needed on the server
M-SON
/ˈmeɪs(ə)n/
noun
noun: mason; plural noun: masons; noun: Mason; plural noun: Masons
- a person skilled in cutting, dressing, laying stone in buildings.
"the chief mason at Westminster Abby"- a Freemason
"a Mason's handshake"- a pormantau of Model and JSON
"check out these awesome msons, yo"- a modelling Minecraft library that combines entity models and behaviours with the ability to load json files
"dude, you gotta use M-Son"
verb
- build from or stengthen with stone
"the other building was masoned up out of hewn limestone"- cut or dress (stone).
"one course of massive stones, roughly masoned"
What is Mson?
Wiki | Model Language Definition
Mson is a fabric library/mod for defining and loading entity models through configurable json files.
It makes modders' lives easier by taking the model geometry out of the code and putting it in a place where it's separated from game logic, and it makes player's lives better by making it possible for your models to be customised and replaced using nothing more than a resourcepack.
Getting Started [ResourcePack & Mod Creators]
When MSON is installed, every entity model in the game can be loaded from an equivalent json file in the `assets//models/entity/mson` folder. Check this folder for a short list of example models made to closely (and in some cases not very closely) match the equivalent model for a limited few vanilla entities.
For a more complete list, and instructions on how to convert models already loaded into the game, check the Sample 1.20.1 Models wiki page.
Getting Started [Mod Creators]
Want to register your own models to load with mson? Doing so is as simple as:
`assets//models/entity/my_model.json`
`static ModelKey<MyEntityModel MY_ENTITY_MODEL = Mson.getInstance().registerModel(new Identifier("mymod", "my_model"), MyEntityModel::new);`
- `MyEntityModel model = MyModels.MY_ENTITY_MODEL.createModel();`
Want to create a humanoid model? Mson already bundles models for steve, alex, and a simplistic quadruped, so just specify { "parent": "mson:steve" } as your starting model and add override for each body part as you go. Check here for examples!
FAQ
How to install Mson?
Install Fabric for your Minecraft version, download Mson for the same version and loader, put the file into the mods folder and launch the game with the loader profile.
Which Minecraft versions does Mson support?
Mson has builds for Minecraft 1.20.5–1.21.8, 1.21.10–26.3.
Is Mson needed on the server?
Client only — no need to install it on the server