ModsFinder

Mod Checker - Mod

by HexaFoxxx

Mod Checker is a Fabric companion mod that reports a player's installed client mods to a server during login so the server can decide whether to admit the player.

FabricClient-side onlyAll rights reserved1.21.11

What it does

When a player joins a server running Mod Checker, the client mod takes part in the handshake and sends its list of installed mods to the server. The server compares that list against the rules it has been configured with and confirms compatibility before gameplay begins. The client can also manage mods locally, while the report stays the reliable, tamper-resistant record the server relies on.

Mod Checker is described by its author as the official companion to a server-side verification plugin. It is useful on servers that need players to run a specific set of mods, and it adds no extra setup for players, because the mod list is shared automatically during connection. Client-side only, so servers do not install it. Published for Fabric, for 1.21.11 only, with version 1.0 dated 2026-04-03 as the latest file. Released under All rights reserved, so it is not open source.

Key features

  1. Automatic mod list sharing

    The installed mod list is shared with the server during connection, without extra steps from the player.

  2. Server compatibility checks

    The server confirms the client meets its requirements before a player is allowed to join.

  3. Tamper-resistant reporting

    The report is built to be reliable, giving servers a trustworthy basis for admission decisions.

  4. Light footprint

    The mod has a simple, focused purpose and a minimal performance impact.

Compatibility

Latest build for each game version and loader.

1.21.111.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Balanced servers

Server owners who enforce a mod policy can use the report to keep clients within the allowed set.

Who it’s for: Server owners who require a specific set of client mods, and players who join those servers.

How it compares

Full comparison

Poime's Mod Checker is open source under the MIT License, published for Fabric 1.21.4, and runs as client and server. Modsender is a Fabric client mod for 1.21 – 1.21.11 that is required on the client with an optional server side, and is not open source. Mod Checker, by contrast, is client-side only and not open source.

ModLoadersGame versionsEnvironmentUpdated
Mod Checker - ModFabric1.21.11Client-side only2026-04-03
Poime's Mod CheckerFabric1.21.4Client and server2025-05-26
ModsenderFabric1.21 – 1.21.11Client required, server optional2026-06-18

Questions

Does Mod Checker need to be installed on the server?

No. Servers do not need it; each player installs it for their own game. Servers that want the report must run their own verification plugin.

Which loader and game version does Mod Checker support?

Mod Checker is published for Fabric only, for 1.21.11 only. Its latest file is version 1.0, released 2026-04-03.

Does Mod Checker share mods automatically?

Yes. The installed mod list is shared during connection without extra setup, so players do not need to configure anything.

What the author says

Mod Checker – Mod (Client) is the companion mod to the Mod Checker plugin, designed to ensure secure and transparent connections between players and servers. Acting as a verification layer during login, it communicates directly with the server to provide an accurate list of installed client mods. When joining a…
HexaFoxxx, on the Modrinth page

Official listing

Owner
HexaFoxxx
Published
2026-04-03
Updated on Modrinth
2026-04-03
Facts verified
2026-10-15
Open on ModrinthCompare