How to Install Mods on a Minecraft Server (2026)

Forge vs Fabric

Before installing mods, you need a mod loader. There are two main options:

Forge

Largest mod library. Best for big modpacks (ATM, FTB, Enigmatica). Heavier on resources.

Fabric

Lightweight and fast. Growing mod library. Best for performance mods and smaller setups.

Forge and Fabric mods are not compatible with each other. Choose one and stick with it.

Installing Forge on Your Server

Download the Forge installer for your Minecraft version from files.minecraftforge.net
Run the installer and select “Install Server”
Point it to your server directory
Run the generated forge-*.jar file instead of the vanilla server.jar
Accept the EULA, then stop the server
Drop your mod .jar files into the mods/ folder
Start the server again — Forge will load all mods automatically

Installing Fabric on Your Server

Download the Fabric server installer from fabricmc.net
Run it with: java -jar fabric-installer.jar server -mcversion 1.21.4
This creates a fabric-server-launch.jar
Install Fabric API into the mods/ folder (required by most Fabric mods)
Add your mod .jar files to the mods/ folder
Start the server with the Fabric launcher JAR

Installing a Modpack

Modpacks bundle dozens or hundreds of mods together. The easiest way to run one:

Download the server pack from CurseForge or the modpack’s official page
Extract the server files to your server directory
Run the included start script (startserver.bat or startserver.sh)
Players install the same modpack on their client using a launcher like CurseForge, ATLauncher, or Prism

Hosting tip: Modpacks are RAM-hungry. ATM9 needs 8–12GB minimum. Make sure your server plan has enough memory before installing a heavy modpack.

Client-Side vs Server-Side Mods

Server-side only: Plugins like Dynmap, performance mods like Lithium (Fabric). Players don’t need these installed.
Both sides: Content mods that add blocks, items, or mobs (Create, Mekanism, Botania). Must match versions on server and client.
Client-side only: Shaders, minimaps (JourneyMap), UI mods (Inventory Tweaks). Server doesn’t need these.

Troubleshooting

Server won’t start: Check logs/latest.log for errors. Usually a mod version mismatch or missing dependency.
Players can’t connect: Ensure client and server have the exact same mods and versions. Even minor version differences cause connection failures.
Lag or crashes: Remove mods one at a time to identify the culprit. Use Spark profiler to find performance bottlenecks.

Frequently Asked Questions

Forge or Fabric — which should I use?

Forge has more mods available, especially large modpacks. Fabric is lighter and better for performance mods and smaller setups. Choose based on which mods you want to run.

Do all players need the same mods installed?

Server-side mods only need to be on the server. Content mods (new blocks, items, mobs) must be installed on both server and client. Players need matching mod versions.

How much RAM do modded servers need?

Light modpacks: 4–6GB. Medium modpacks (100+ mods): 6–8GB. Heavy modpacks like ATM9 or FTB: 8–12GB.

Conclusion

Installing mods on a Minecraft server is straightforward once you've chosen your mod loader. Use Forge for big modpacks, Fabric for lightweight setups, and always make sure your server has enough RAM for the mods you're running.

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