CurseForge · Minecraft mod
WhatLIB?
ESS Presents - WhatLIB, Uses ESH to display a menu showing current modpacks dependency trees, will list which mods use what, and if any redundant ones are present. Mainly for modpack makers, and server owners.
Quick answer
Which WhatLIB? release should I use?
WhatLIB? whatlib-1.0.1+1.21.1-neoforge targets 1.21.1 with NeoForge. 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 WhatLIB? 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 WhatLIB? whatlib-1.0.1+1.21.1-neoforge need?
whatlib-1.0.1+1.21.1-neoforge. Change the file and its required mods may change too.
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 WhatLIB? without breaking your instance.
Built for WhatLIB? whatlib-1.0.1+1.21.1-neoforge. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use whatlib-1.0.1+1.21.1-neoforge. It targets 1.21.1 with NeoForge; 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 whatlib-1.0.1+1.21.1-neoforge. It opens that exact file at the source.
About this project
What does WhatLIB? add?
WhatLIB?
Is a lightweight information and discovery library for Minecraft mods. It provides shared infrastructure for discovering, inspecting, and exposing information about the mods and systems currently running in a game instance.
Not a standalone library, and is not part of the Extra Special Studio (ESS) mod stack. It uses Extra Special Core (ESC) for its GUI systems and Extra Special Hub (ESH) as the in-game interface through which its information is displayed.
What It Does:
WhatLIB? provides reusable systems for mod discovery, runtime environment inspection, mod metadata, dependency information, integration information, and developer/debugging tools.
It gives other mods a common way to access information about the current modded environment without every project having to implement its own discovery and inspection systems.
How It Works:
WhatLIB? handles the information and discovery side of the system.
ESC provides the GUI rendering, composition, styling, and other visual infrastructure used by the WhatLIB? interface.
ESH provides the in-game hub and navigation layer used to access and display WhatLIB? information.
This keeps the information systems, visual framework, and hub interface as separate components while allowing them to work together as a complete in-game tool.
How To Use It:
Install WhatLIB? alongside its required dependencies.
WhatLIB? is primarily developer infrastructure rather than a standalone gameplay feature. Compatible mods can use its APIs to discover and inspect information about the current Minecraft environment.
When installed, its in-game interface is accessed through ESH and rendered using ESC.
Dependencies:
- Extra Special Core (ESC) (required) – Provides the GUI rendering and composition framework used by WhatLIB?.
- Extra Special Hub (ESH) (required) – Provides the in-game hub and interface used to access WhatLIB?.
- Forge – Minecraft Forge 47.0+.
- Minecraft – 1.20.1.
Project description from CurseForge.
Pick your setup
WhatLIB? by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
WhatLIB? versions and loaders
whatlib-1.0.1+1.21.1-neoforge
whatlib-1.0.1+1.21.1-neoforge.jar
15 Sept 2026
whatlib-1.0.1+1.20.1-forge
whatlib-1.0.1+1.20.1-forge.jar
15 Sept 2026
whatlib-1.0.0+1.21.1-neoforge.jar
19 Aug 2026
whatlib-1.0.0+1.20.1-forge.jar
19 Aug 2026
Looking for an older file? The official CurseForge project page is in Resources.