FairPlay
by penguinmc
Players join a FairPlay server with the client mod list checked, and the server can refuse joins from players running prohibited mods.
What it does
FairPlay is a Fabric mod that checks which client mods a player has installed when the player joins a server. Its client mod list shows the active mods on the client, and the server compares them against a blacklist of mods it prohibits. The mod can also kick players who run a blacklisted mod, and a timeframe setting controls how long the mod validation may take during the join.
The mod is configured through fairplay.json in the server config directory. Its values are plain JSON lists and arrays, and the file carries an internal schema version so that older configs can be migrated. Files are published for Fabric only, for the 26.1 and 26.2 game versions, with 1.1.0+26.1 for 26.2 as the latest build. The environment is client and server, so the server and every player need the mod, and the code is covered by the MIT License but is not open source.
Key features
Client mod list
The server reads the list of active client mods on each joining player and keeps the result for the server owner to check.
Mod blacklist
Server owners define a configurable list of prohibited mods that the validation checks against.
Automatic kick
Players running a blacklisted mod can be kicked on join, a behavior the server owner can switch on or off.
Join timeframe
An adjustable timeframe sets how long the mod validation may run while a player connects.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Fair competitive servers
Server owners who want every player on the same mod footing can block mods that give an unfair advantage.
Modpack enforcement
A pack maintainer can require the mods the pack ships and reject players who add prohibited ones.
Who it’s for: Server owners who run Fabric servers and want to check the client mods that connecting players are running.
How it compares
ValiMod is a Fabric mod for 1.20.4 – 1.20.6 with the same client and server environment, under the MIT License. Item Pickup Blacklist is a client-side only Fabric mod for 26.2 under All rights reserved, so it runs on a player's client alone. MobsFilter is server-side only, open source under the MIT License, and targets 1.21.11 for Fabric.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| FairPlay | Fabric | 26.1 – 26.2 | Client and server | 2026-06-08 |
| ValiMod | Fabric | 1.20.4 – 1.20.6 | Client and server | 2026-07-25 |
| Item Pickup Blacklist | Fabric | 26.2 | Client-side only | 2026-08-03 |
| MobsFilter | Fabric | 1.21.11 | Server-side only | 2026-03-21 |
Questions
Does FairPlay need to be installed on the client?
Which game versions does FairPlay support?
Where is the blacklist configured?
In the catalog
FairPlay is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 13,894 mods support Minecraft 26.2.
More from penguinmc
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/fairplay
- Owner
- penguinmc
- Published
- 2026-06-01
- Updated on Modrinth
- 2026-06-08
- Facts verified
- 2026-10-15