ModsJava
Modpack Checker
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
Modpack Checker
A lightweight Fabric mod to verify that players use the correct modpack version on your server.
Features
- Simple version-based client-server check (no modlist comparison)
- Automatic disconnect with helpful messages
- Easy-to-edit TOML config files for both client and server
/reloadsupport to apply changes without restarting- Dev mode: use version
0.0.0to disable checks during development
How It Works
- Server sends a version check during login
- Client replies with the version from
modpack-checker-client.toml - Server compares it to its expected version
- If mismatched, the player is kicked with a custom message
Configuration
Server (config/modpack-checker-server.toml):
enable = true
expected_version = "1.0.0"
[messages]
no_mod = "Please install the Modpack: <your-modpack-link>"
wrong_version = "Please install modpack version {version}: <your-modpack-link+version>"
server_error = "Server configuration error. Please contact an administrator."
Client (config/modpack-checker-client.toml):
version = "1.0.0"
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20, 1.20.1, 1.20.2
- 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.
Verified by MCModsHub
- Ships as ModpackChecker-0.1.2+1.20.x.jar — drop this file into the mods folder
- Download size: 381 KB
- Download link checked 31 Aug 2026 — working
These come from our own check of the pack file, not from the source page.