About Compat API
From ModrinthUniversal compat api that auto-loads integrations, data packs and loot modifiers for mods that depend on it.
📖 About
Compat API is a lightweight and universal compatibility framework for the entire “Compat” ecosystem by fixerlink — including Compat Delight, the upcoming Compat Artifacts, Compat Decor, and any third-party mod that wants an easy, automated way to add cross-mod integrations.
Instead of hardcoding compat logic or manually managing data packs, Compat API handles everything for you: auto-loading compat code, injecting data packs, wrapping loot modifiers, applying conditions, and enabling integrations only when the required mods are installed.
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📃 Features
- Smart Compat Scanner: Loads integrations only from mods that explicitly depend on Compat API.
- Automatic Compat Code Loading:
Detects compat modules in net.<owner>.<moid>.compats.<target> and runs their register, init, or bootstrap hooks automatically.
- Automatic Data Pack Injection:
Loads content from data/<owner>/<modid>/compats/<target> as built-in data packs — only when the target mod exists.
- Universal Loot Modifier System:
Adds compat conditions automatically and generates the global loot modifier list.
- Compatibility Conditions:
Built-in condition compatapi:compat_enabled ensures integrations load safely and only when appropriate.
- Per-Target Config Toggles:
Every compat module can be enabled or disabled individually via config.
- Safe & Clean System:
Compat errors never crash the game — they’re logged and gracefully skipped.
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📝 Description
How it works:
You install Compat API. That’s it.
If a mod depends on Compat API and includes compat modules, the API will:
- detect its compat code
- inject its compat data packs
- wrap its loot modifiers
- apply conditions
- and enable integrations automatically
If the target mod is missing — the compat simply won’t load. No errors, no crashes, no manual setup needed. Mods can freely add compat folders and classes — Compat API does all the heavy lifting. And of course, every integration can be toggled via config.
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🎁 Bonus Info
- Mods that do not depend on Compat API are fully ignored
- All integrations load only when their target mods are present
- Errors in compat code never break the game
- Fully automated system: code, data packs, conditions, loot modifiers
- Supports thousands of integrations with minimal boilerplate
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🧾 Credits
Compat API is developed by fixerlink as a universal standard for all Compat-series mods and for developers who want clean, modular, and automated cross-mod integrations.
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Feedback is welcome!
Highlights
From source dataGame versions
Supports 2 Minecraft versions, the newest being 1.21.1.
Loaders
Runs on Fabric, Forge and NeoForge.
Footprint
Rated a light load on a server.
What kind of mod it is
From the catalogLibraries & compatibility
Foundations and fixes other mods build on. Usually installed because something else needs it.
Runs on your server
From source side supportModrinth lists Compat API as required on the server. Check its Modrinth page to see whether players need it too.
Compatibility
- Game
- Minecraft
- Loaders
- FabricForgeNeoForge
- Runs on
- Serverrequired on the server
- Game versions
- 1.21.1 and 1 earlier
Verified at the source
- ✓ModrinthOfficial listing, checked 2026-10-01Open ↗
- ✓AuthorFixerLink, as published on Modrinth
- ✓LicenseMITFree









