FastLib
by deus_robson
FastLib is a shared library for Forge mods, offering reusable systems that other developers can build on for 1.20.1.
What it does
Developers who write Forge mods can depend on FastLib instead of rebuilding common infrastructure. Its core aims to cut duplicated code, so advanced mod work takes less effort, while the included systems are tuned to stay efficient and scalable. Epic Fight is listed as a required dependency, so it must be installed alongside FastLib.
Its modules cover a built-in camera framework with smooth interpolation, lock-in target tracking and programmable movement, plus an extensible architecture for custom camera behaviors. Further parts include a math toolkit of reusable utilities, an event infrastructure that lets independent systems communicate with less coupling, and custom data structures meant to improve usability and runtime cost.
The library is published for Forge only, for 1.20.1, and runs on the client and the server, so both sides need it. The code is not open source and is distributed under the All rights reserved license, though public source code links exist. Files were first published and last updated on 2025-09-27.
Key features
Built-in camera system
Smooth camera transitions, lock-in target tracking and programmable positioning come ready to use, with support for custom behaviors.
Math toolkit
Reusable mathematical utilities and abstractions cover calculations that mod code commonly needs during development.
Event infrastructure
Event channels let separate systems exchange messages without direct references to one another.
Custom data structures
Purpose-built structures and helper utilities are included for common storage and lookup tasks.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
FastLib is a Forge library for 1.20.1 with client and server environment and an all rights reserved license. RaccoonCore is also a Forge library, client and server, for 1.20.1 – 1.20.6, and is open source under the GNU General Public License v3.0 only. KopperLib and MobCivics are both Forge, client and server, for 1.20.1 – 1.20.6, each under the MIT License, and neither is open source. CameraAPI covers 1.20.1 – 1.20.6 and is open source under the MIT License, but it is client-side only, so servers do not need it.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| FastLib | Forge | 1.20.1 | Client and server | 2025-09-27 |
| RaccoonCore | Forge | 1.20.1 – 1.20.6 | Client and server | 2026-08-11 |
| KopperLib | Forge | 1.20.1 – 1.20.6 | Client and server | 2026-08-11 |
| MobCivics | Forge | 1.20.1 – 1.20.6 | Client and server | 2026-03-12 |
| CameraAPI | Forge | 1.20.1 – 1.20.6 | Client-side only | 2026-05-16 |
Questions
Does FastLib need Epic Fight?
Does FastLib have to be installed on the server?
Can FastLib be used for other Forge versions?
Is the FastLib source code available?
In the catalog
FastLib is one of 3,514 Library mods on ModsFinder, and one of 1,576 Library mods for Forge. 34,764 mods support Minecraft 1.20.1.
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What the author says
FastLib is a lightweight shared library for Minecraft Forge mods, built to provide reusable systems, optimized utilities, and a consistent development foundation across my projects — while remaining fully open source and available for anyone to use. At its core, FastLib is designed to reduce duplicated code and make…
Official listing
- Modrinth page
- modrinth.com/mod/fastlib
- Owner
- deus_robson
- Published
- 2025-09-27
- Updated on Modrinth
- 2025-09-27
- Facts verified
- 2026-10-15