ModChecking
by A-TEAM
ModChecking lets a Fabric server admit only clients that carry an approved list of mods, so a player missing a required mod is turned away at login.
What it does
A server running the ModChecking plugin keeps a registration list of required mod IDs. When a Fabric client connects, the plugin reads the mods that client reports and compares them with that list. A client that lacks a required mod is refused entry and told which mod to install, and a client carrying the full list joins without further steps.
The plugin installs on Paper, Spigot, Bukkit, Purpur and Folia, so it fits the server platforms and does not need a separate build for each. Its client part is a small Fabric mod that reports the installed mods. Only the server side enforces the list, which lets a server owner set a mandatory combination of mods for everyone who plays on it.
Twelve release versions have files, with modcheck-client 1.0.0 for 1.21.11 as the latest Fabric file, published on 2026-06-10. The project is released under All rights reserved and is not open source. Issues are tracked on a public issue tracker.
Key features
Required mod list
The server stores a registration list of mod IDs, and every connecting client must report the listed mods.
Login refusal
A player without a required mod is stopped at login and told which mod still needs to be installed.
Client reporting
A Fabric client mod sends the installed mods to the server, where the plugin checks them against the list.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Mandatory mod sets
A server owner can require a fixed combination of client mods, so every player on the server runs the same set.
Community servers
Servers that rely on particular client mods can keep players who lack them from joining without reading the rules first.
Who it’s for: Server owners who want to enforce a set of client mods at login. The plugin is intended for server installations, and players need the matching client mod to pass the check.
How it compares
BackToServerList is a Fabric client mod released under the MIT License, open source, and works for 1.21 – 1.21.11, with the client-side only environment. ServerLogViewer is a Fabric client mod with MIT License, open source, for 1.21.8 – 1.21.10, also client-side only. ModChecking works from the server side and enforces the list rather than only listing or viewing logs, and its license is All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| ModChecking | Fabric | 1.21 – 1.21.11 | Not published | 2026-06-10 |
| BackToServerList | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-02-06 |
| ServerLogViewer | Fabric | 1.21.8 – 1.21.10 | Client-side only | 2025-11-23 |
Questions
Does a player need the client mod to join?
Which server platforms does ModChecking support?
Which game versions have files?
In the catalog
ModChecking is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from A-TEAM
Similar mods
What the author says
A unique combination of a mod and a server-side plugin to enforce mandatory mods. This is a client mod and a server plugin. It is very useful for servers that do not have mods, but you want to have client mods on the server. Access to the server is only allowed for the Fabric client and with a list of specific mods…
Official listing
- Modrinth page
- modrinth.com/mod/modchecking
- Owner
- A-TEAM
- Published
- 2026-06-10
- Updated on Modrinth
- 2026-06-10
- Facts verified
- 2026-10-15