Screenshot 1 of 1. MinecraftHub-generated editorial cover for Curios API, a voxel diorama around the lime MinecraftHub block
What Curios API works with.
| Platform | Java Edition |
|---|---|
| Loaders | NeoForge |
| Minecraft versions | 1.20, 1.20.6, 1.21.11, 26.1.2, 26.2, 26.3 |
| Environment | Client, Server |
Curios API is a Minecraft Java library mod from TheIllusiveC4. It gives other mods a shared way to add accessory and equipment slots, and gives players a way to configure those slots. On its own it adds only an inventory GUI (default keybind g) and two example items available from the Creative menu. It is plumbing, and it is required on both client and server.
What curios slots do in Minecraft
No slots exist by default. A dependent mod registers slot types through an identifier registry, and identical identifiers merge so different mods share one slot instead of stacking duplicates. Slots are created on demand, which reduces superfluous slots with no suitable items. Slots can have custom backgrounds and sizes, and can be disabled or hidden. Items become curios through vanilla tags in data/curios/tags, so a datapack can reassign them. Mending and curses work on items equipped in curio slots. Until a mod registers slots, the GUI has nothing to show.
Installing curios api
- 1.Confirm your loader (NeoForge, Forge or Fabric) and Minecraft version. A build only runs on the loader and version it was made for.
- 2.Download the matching build from the Curios API page on Modrinth.
- 3.Put the .jar in your mods folder (.minecraft/mods by default), along with any mods that depend on Curios.
- 4.On Fabric, add Fabric API as well. The NeoForge and Forge builds require nothing else.
- 5.For multiplayer, install the same build on the server and on every client.
Loader and version support
- NeoForge: Minecraft 1.20 to 26.3. The newest build, 17.0.0-beta.3+26.3, is a beta published in October 2026.
- Forge (stopped): Minecraft 1.13.2 to 1.20.6. The highest-version build is 8.1.0+1.20.6 from October 2024, and the last one published is 5.14.1+1.20.1 from April 2025.
- Fabric (stopped): one build, 0.0.13 for Minecraft 1.16.5, from February 2023. It requires Fabric API.
See curios api in action
Curios API (Forge) mod overview and install walkthrough
Questions about Curios API.
5 questions
Does Curios API work with Fabric?
Only on 1.16.5. Curios has one Fabric build, 0.0.13 from February 2023, and it requires Fabric API. There is no Fabric build for 1.20.1, 1.21.1 or newer. Fabric builds have stopped, while NeoForge continues through 26.3, so check the loader before you download.
Is there a Curios API for Bedrock?
No. Curios API is a Java Edition mod that runs through a mod loader, and Bedrock Edition cannot load mods in that format. Every build of the project targets Java Edition on NeoForge, Forge or Fabric. Bedrock players cannot use any of those builds.
What does Curios API let players do?
Nothing by itself. It supplies the inventory GUI and slot registry that other mods use to add accessory slots. By default there are no slots and only two example items, available from the Creative menu, so install a mod that registers curio slots.
Does Curios API need to be on the server?
Yes. Curios API is required on both client and server, so put it in the mods folder of the server and of every client joining it. Choose the file that names your Minecraft version and loader, since a build only runs on the loader it was made for.
Which Minecraft versions does Curios API support?
It depends on the loader. NeoForge covers 1.20 to 26.3, and its newest build is a beta. Forge covers 1.13.2 to 1.20.6 but has stopped, and Fabric only has 1.16.5. For 1.20.1 on Forge, the last build is 5.14.1+1.20.1.
