Modsender
by Chifujimo
Modsender is a Fabric client mod that sends the player's mod list to a server when joining, so server administrators can enforce mod whitelists.
What it does
On join, the client reports its installed mods to a server that runs the companion plugin Mod Checker Enhanced. The server compares that list against its allowed set and can flag or refuse players carrying unauthorized mods, which helps keep a server fair.
Players need the mod installed to take part in the check, while a server may leave it out unless it wants to compare mod lists. Using the check requires Mod Checker Enhanced on the server, and Fabric API is needed on the client. Files are published for Fabric only, covering 1.21 – 1.21.11 in twelve release versions, under the MIT License, and the project is not open source.
Key features
Automatic mod list report
The mod list is sent to the server automatically when a player joins, with no manual step.
Whitelist enforcement
Server administrators can use the reported list to enforce whitelists of permitted mods.
Unauthorized mod detection
Mods that are not on the approved list can be detected when a player connects to a checked server.
Companion plugin check
Detection depends on the server running Mod Checker Enhanced, which handles the comparison side of the check.
Compatibility
Latest build for each game version and loader.
1.21.x12 of 12 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Fair competitive servers
Server owners who want equal conditions for all players can require an approved mod set before entry.
Who it’s for: Server administrators who run whitelisted or competitive worlds, and players who join those servers and need to install the client mod.
How it compares
Mod Checker - Mod is client-side only, is not open source and targets 1.21.11 alone. Poime's Mod Checker is open source under the MIT License, runs on client and server, and is built for 1.21.4. ModLogs Mod runs on client and server for 1.21 – 26.2 and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Modsender | Fabric | 1.21 – 1.21.11 | Client required, server optional | 2026-06-18 |
| Mod Checker - Mod | Fabric | 1.21.11 | Client-side only | 2026-04-03 |
| Poime's Mod Checker | Fabric | 1.21.4 | Client and server | 2025-05-26 |
| ModLogs Mod | Fabric | 1.21 – 26.2 | Client and server | 2026-08-04 |
Questions
Does Modsender need Fabric API?
Does a server need Modsender installed?
What must a server run for the check to work?
Which game versions does Modsender support?
In the catalog
Modsender is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
⚠️ NOTE This is only a mod. If u want your server to use this mod you need to install the Mod Checker Enhanced plugin. Please contact the creator if you need any help! Modsender - The essential to keep Minecraft servers as fair as possible.
Official listing
- Modrinth page
- modrinth.com/mod/modsender
- Owner
- Chifujimo
- Published
- 2026-06-18
- Updated on Modrinth
- 2026-06-18
- Facts verified
- 2026-10-15