CurseForge · Minecraft mod
Pufferfish API
A simple API to allow easy multi-version and multi-loader development.
Quick answer
Which Pufferfish API release matches 1.21.4 Forge?
Pufferfish API 1.3.0 for Forge 1.21.4 targets 1.21.4 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.
Where it goes
Is Pufferfish API required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Pufferfish API 1.3.0 for Forge 1.21.4 need?
Pufferfish API 1.3.0 for Forge 1.21.4 on 1.21.4 Forge. Every mod below is checked against that same setup.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Pufferfish API without breaking your instance.
Built for Pufferfish API 1.3.0 for Forge 1.21.4 on 1.21.4 Forge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Pufferfish API 1.3.0 for Forge 1.21.4. It targets 1.21.4 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside Pufferfish API 1.3.0 for Forge 1.21.4. It opens that exact file at the source.
About this project
What does Pufferfish API add?
Pufferfish API
Pufferfish API is a library mod that makes it easier to develop multi-version and multi-loader mods with a single codebase. This is primarily built for my mods (excluding BTA), so stuff could break at any time, and you probably shouldn't build your own mods on top of this. This also doesn't add any content, so you should only install it if one of your mods depends on this.
Currently supported Minecraft versions and loaders:
Mods built with Pufferfish API:
Contribution Guide:
If you would like to contribute to Pufferfish API, please check out our GitHub
This mod is licensed under the MIT license, meaning you are free to distribute this mod and modify it as you see fit, including for commercial purposes, however no warranty is provided and I will not be held liable for anything in regards to this mod.
Project description from CurseForge.
Pick your setup
Pufferfish API by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
26.2
3 loader builds26.1.2
3 loader builds1.21.11
3 loader builds1.21.10
3 loader builds1.21.9
3 loader builds1.21.8
3 loader builds1.21.7
1 loader build1.21.5
3 loader builds1.21.4
2 loader builds1.21.1
3 loader builds1.20.6
3 loader buildsCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Pufferfish API versions and loaders
Pufferfish API 1.3.0 for Forge 1.21.4
pufferfishapi-1.3.0-1.21.4-forge.jar
2 May 2026
Pufferfish API 1.3.0 for Fabric 1.21.4
pufferfishapi-1.3.0-1.21.4-fabric.jar
2 May 2026
Looking for an older file? The official CurseForge project page is in Resources.
Fabric