CheckYourMods
by Alber11
CheckYourMods is a NeoForge 1.21.1 tool that lets server administrators compare the mods and resource packs a player runs against the server's own list.
What it does
On a server that runs it, CheckYourMods reads the mods installed on a joining client and compares them with the server's mod list, ignoring the matches. Mods that are not on the list are reported, so the administrator can see what differs. The check is aimed at keeping a fair-play environment, where client-side modifications and resource packs are monitored rather than assumed harmless.
The tool covers resource packs too. It scans each pack's internal pack.mcmeta metadata for suspicious keywords such as xray or transparent, and administrators can track a specific pack by its SHA-256 fingerprint. Hashes can be added by hand for malicious packs that avoid the keyword scan. Client-side utility mods such as OptiFine or voice chat can be added to an allowed list so they are not flagged.
The mod is built for private friend servers, where one player getting a suspicious mod should not force everyone else to avoid it. It runs on both the client and the server, so both sides carry it. Its source code is public, the code is open source under the MIT License, and the files target NeoForge only, for 1.21.1.
Key features
Mod list comparison
Mods on a joining player's client are matched against the server's mod list, and only the unmatched entries are shown.
Resource pack keyword scan
Each pack's pack.mcmeta is searched for keywords such as xray and transparent.
SHA-256 pack fingerprints
A specific resource pack can be tracked by its unique digital hash, including hashes added manually.
Allowed mod IDs
Client-side utility mods can be listed as allowed so the comparison does not flag them.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Friend servers
A small group can check that everyone runs the same mods before playing together.
Server administration
Administrators can check which client mods and resource packs connecting players use.
Who it’s for: Server administrators who want a visible check on client mods and resource packs, and groups running private servers who want to keep suspicious mods off the server.
Questions
Does CheckYourMods have to be installed on both sides?
Which loader and version does CheckYourMods support?
Can a known utility mod be kept off the report?
In the catalog
CheckYourMods is one of 8,016 Management mods on ModsFinder, and one of 2,689 Management mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
CheckYourMods is an advanced security and transparency tool for Minecraft 1.21.1 (NeoForge) designed for server administrators. Specifically designed for friends' servers to ensure that no one is downloading suspicious mods that aren't necessary to play or cheating. It ensures a fair play environment by monitoring…
Official listing
- Modrinth page
- modrinth.com/mod/checkyourmods
- Owner
- Alber11
- Published
- 2026-01-10
- Updated on Modrinth
- 2026-01-10
- Facts verified
- 2026-10-15