NexusSync
by seno_poleno
NexusSync is a NeoForge mod that lets players join modded servers without manually matching their mod lists, by syncing mods from the server automatically.
What it does
When a player connects to a server that runs NexusSync, the mod compares the player's installed mods with the server's set and fetches, updates or removes mods to match. Mods can be marked mandatory or optional, and optional ones can be skipped by the player. A server-side blacklist lets server admins block forbidden cheat mods, resource packs and other entries through a blacklist.json file, and the rules are streamed to clients directly so the server's integrity is protected.
Setup needs no external launcher or modpack updater: the mod works inside standard Minecraft. Server owners can run nexussync reload to re-scan mods, refresh the update manifest and the MOTD without restarting the server. In the multiplayer server list, a Join Sync button next to each server entry starts the process, and players check a confirmation screen, click the button to fetch the mods and restart once they are in place. After that the game is fully up to date and ready to play.
NexusSync is client and server, so both the server and every player need the mod. It is released under the MIT License and is not open source. Its files target NeoForge for 1.21.1, with the latest build 2.0.0 published on 2026-08-15.
Key features
Automatic mod sync
Fetches, updates and removes mods on the client so it matches the mod list of the server it joins.
Server-managed blacklist
Server admins list forbidden cheat mods, resource packs and other entries in blacklist.json.
Hot reload
The nexussync reload command re-scans mods and refreshes the update manifest and MOTD while the server keeps running.
Join Sync button
A button beside each server in the multiplayer list starts the sync, followed by a confirmation screen.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who run modded multiplayer and want players to match the server's mods, and players who join such servers and prefer not to set up mods by hand.
How it compares
CleanMaid is server-side only, released under the MIT License and open source, with files for 1.21.1, so players need nothing installed. FXClear Items is also server-side only for 1.21.1, but it is released under All rights reserved and is not open source. Further Difficulty Config is client and server like NexusSync, released under the MIT License and not open source, with files for 1.21.1 – 26.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| NexusSync | NeoForge | 1.21.1 | Client and server | 2026-08-15 |
| CleanMaid | NeoForge | 1.21.1 | Server-side only | 2026-04-27 |
| FXClear Items | NeoForge | 1.21.1 | Server-side only | 2026-08-10 |
| Further Difficulty Config | NeoForge | 1.21.1 – 26.1 | Client and server | 2026-04-20 |
Questions
Does NexusSync need to be installed on both sides?
Which loader does NexusSync use?
Can the server be updated without a restart?
In the catalog
NexusSync is one of 5,392 Social mods on ModsFinder, and one of 1,784 Social mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
NexusSync is a lightweight, zero-setup client-server mod synchronization mod for NeoForge. It enables players to connect to modded servers seamlessly by automatically downloading, updating, or removing mandatory and optional mods with server-side blacklist protection. 🇷🇺 Описание на русском языке (Russian…
Official listing
- Modrinth page
- modrinth.com/mod/nexussync
- Owner
- seno_poleno
- Published
- 2026-08-15
- Updated on Modrinth
- 2026-08-15
- Facts verified
- 2026-10-15