Mod Observer
Mod that checks other mod's presence. Upon joining a server that requires you to install this mod, it checks, if the loaded mods are allowed or not.
⬇ Download on Modrinth
DISCLAIMER: This project is experimental
ModObserver, as the name suggests, observes, which mods are loaded, and upon joining a server, sends those mods to the server. The server owner can adjust, which mods are allowed and which are not.
When you try to join a server, that requires you to have ModObserver, you will get a kick message similar to this one:
For server owners: if you want ModObserver on your server, download this plugin: https://modrinth.com/plugin/mod-observer-plugin
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.11
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as ModObserver-client-3.0.2+mc1.21.11.jar — drop this file into the mods folder
- Download size: 198 KB
- Download link checked 20 Sept 2026 — working
These come from our own check of the pack file, not from the source page.