JMX
ModAdds more ways for resource packs to define block and item models.
Why gradeD
How grades workStrengths
Points lost
- No release in 3 years−26 points
- Many modpacks removed it−5 points
- Under 5 million downloads−1 point
All 11 criteria
Maintenance
18 points lost9 / 27Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.3 years ago (14 Oct 2023) 0 / 12Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.1.20.1 on Fabric and Quilt. 15% or more of the popular mods updated in the last 6 months also have files for 1.20.1. Latest Minecraft: 26.3. 9 / 9Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.No release in the last 24 months 0 / 6Stability
5 points lost10 / 15Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.4 of the 15 modpacks with two or more versions removed it in a later one (27%) See the 4 modpacks5 / 10Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.Not measured yet.Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5Transparency
Full points10 / 10Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · grondag/json-model-extensions 7 / 7Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · vram-guild/json-model-extensions 3 / 3Popularity
1 point lost3 / 4DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.581,075 3 / 4Track record
8 points lost0 / 8AgeHow long the project has existed. It counts less when no new file came out recently.7.3 years, 54 releases 0 / 8Security
PassedFile checksThis check adds no points. It can only take points away.Our checks found nothing harmful in the latest file for recent Minecraft versions. See Security
31.8 of the 64 points that apply = 50 out of 100. The points above are rounded to whole numbers.
About
JSON Model Extensions (JMX) extends Minecraft’s JSON model loading so resource-pack and mod authors can build richer block and item models while retaining compatibility with vanilla model JSONs. Its model definitions can assign alternate textures and up to two sprite layers to each face, with material settings for properties such as render layer, lighting, diffuse shading, and ambient occlusion. Layered faces support practical effects such as borders, decals, detail overlays, and glowing ore; for example, a redstone ore model can place emissive ore details over a base texture. JMX also supports inherited materials and ready-made extended versions of many vanilla parent models, and can generate retextured versions of existing JSON models without requiring a separate model file for each one. Models can provide one set of textures and materials for JMX and a separate set for FREX renderers, allowing shader-oriented appearances to be used when available while retaining a non-shader enhanced version otherwise. JMX can optionally load all JSON models as Fabric or FREX meshes, which may modestly reduce memory use through more efficient data structures.
Written from Modrinth . How we write it
In-game changes
Changes the game's code in 2 areas, as a library other mods build on: World renderingChanges 5 game code files in this area: drawing the terrain, sky, clouds and weather. and Rendering and graphicsChanges 2 game code files in this area: drawing mobs, items, particles and textures on screen..
Libraries packed inside it change 46 more game code files: parts of 
Fabric API and FREX.
Adds no new blocks, items or other content.
Keeps all of vanilla Minecraft's textures, models and sounds.
Details
- Creators
- grondag and spiralhalo
- License
- GNU Lesser General Public License v3.0 only
- Downloads
- 581K
- Created
- 11 Jun 2019
- Official pages
- Modrinth , CurseForge
- Links
- Source code , Issues , Wiki , Discord
Security
No harmful code found
We checked its files and read their code, without running it.
What it can do on your computer
- Creates settings files
- The mod keeps its settings in the config folder of your game, where you can change or delete them. 1 file in your config folder.
Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.
How we checked
- FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.17 latest files: the newest file for each Minecraft version and loader. The answer above is about the one for a recent version. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
- Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.Read without running it
- Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.Nothing declared about your system outside the game.
- Looked for, not foundWe looked for these in the file and did not find them.The internet, folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.
Privacy
We found nothing it sends
We read its code without running it: it contacts no web address while you play.
Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.
How we checked
- Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.The code of its one file, for recent Minecraft versions. See each file in Releases
- Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.Nothing declared about crash reports, usage data or advertisements.
AI
No sign so far that AI was used to make it
We looked for AI tools in its texts, files and images and found none.
We have not read its code history yet.
No sign of AI in the game
We found no AI service, AI library or AI model file in its code.
Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.
How we checked
- Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.No AI content or AI features declared.
- Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.Not read yet
- Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.Nothing found2 of 40 changelogs read
- Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.Nothing found
- Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.Nothing found1 image read
- Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.No AI service, AI library or AI model file360 code files read
Compatibility
See all 54 filesPoint at or tap a version to see its loaders.
Related projects
Projects that need JMX to work.
Modpacks using this project
Find modpacks with itModpacks that include JMX in at least one of their versions, most downloaded first.
All of Fabric 3 - AOF31.1M downloadslast version with it 1 Feb 2022
Randomly Added Mods: Fabric Edition6.3K downloadslast version with it 15 Feb 2020
StableJava4.5K downloadslast version with it 6 Jul 2021
The Exile Project Origins2.4K downloadslast version with it 31 Mar 2022
Fabric Adventure2.2K downloadslast version with it 12 Apr 2021
General Fabric Performance1.5K downloadslast version with it 22 Jun 2022
oshpack1.4K downloadslast version with it 28 Jun 2023
MS TechPack Fabric Edition1.3K downloadslast version with it 26 May 2021
SPECTRUM optimization925 downloadslast version with it 7 Mar 2024
Neptunium Survival Client839 downloadslast version with it 5 Nov 2022Latest files
The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.