Server Expansion
by mykodb
Server Expansion adds server-side utilities for clearing entities and dropped items, managing a cleanup blacklist, and greeting players with welcome messages.
What it does
Server owners can clear entities and dropped items on the server through the mod's commands and manage a cleanup blacklist, so listed items are kept during a sweep. A recycle clear option is included for the same purpose. The mod is described as a server-side extension that implements several extended server features, and it targets NeoForge only.
Only the server needs the mod: players join without installing it, and clients need nothing extra. It depends on Kotlin for Forge and Server I18n API, both of which must be present on the server alongside it. Files are released for 1.21.1 only, with 1.1.1 for 1.21.1 as the latest build, published 2026-03-21 after a first release on 2025-05-07. The code is open source under the MIT License.
Key features
Clear entities
A command clears entities on the server, which helps reduce lag caused by large numbers of loaded entities.
Clear dropped items
Dropped items on the ground can be cleared in one action, without touching other entities.
Cleanup blacklist
Items placed on the cleanup blacklist are excluded from clear actions, so valuable drops survive a sweep.
Welcome messages
Players receive configurable welcome messages when they join the server.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Use cases
Routine lag control
Server owners run periodic clears of entities and dropped items to keep tick times stable on busy worlds.
Protecting valuable drops
Items on the blacklist stay in place during sweeps, so players do not lose gear to a routine cleanup.
Who it’s for: Server owners running NeoForge 1.21.1 who want cleanup and welcome-message tools on the server without requiring anything from players.
How it compares
CleanMaid is also server-side only and open source under the MIT License, published for 1.21.1 on NeoForge. NexusSync needs both client and server, is not open source, and is also published for 1.21.1 under the MIT License. Custom Clear Lag covers 1.20.4 – 1.21.4 on NeoForge, runs on client and server, and is open source under the Apache License 2.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Server Expansion | NeoForge | 1.21.1 | Server-side only | 2026-03-21 |
| CleanMaid | NeoForge | 1.21.1 | Server-side only | 2026-04-27 |
| NexusSync | NeoForge | 1.21.1 | Client and server | 2026-08-15 |
| Custom Clear Lag | NeoForge | 1.20.4 – 1.21.4 | Client and server | 2025-03-17 |
Questions
Does Server Expansion need to be installed on the client?
Which loader does Server Expansion support?
Which dependencies must be installed with it?
Can valuable items be kept during a clear?
In the catalog
Server Expansion is one of 3,545 Optimization mods on ModsFinder, and one of 1,250 Optimization mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/server-expansion
- Owner
- mykodb
- Published
- 2025-05-07
- Updated on Modrinth
- 2026-03-21
- Facts verified
- 2026-10-15