How to add mods to your Arma Reforger server

Arma Reforger downloads its own mods. You list them in the config and the server fetches them from the Workshop on the next start. There is nothing to upload.

1. Get the mod ID

1. Open the mod's page in the Reforger Workshop.
2. Copy the mod ID. It is a 16 character code made of letters and numbers.
3. Note the exact mod name as well. It is only used for readability but it helps when the list grows.

2. Add it to the config

1. Stop the server and open the JSON config in the Files tab.
2. Find the mods array inside the game block.
3. Add one entry per mod:

"mods": [
  { "modId": "5AAAAAAAAAAAAAAA", "name": "Example Mod" }
]

• Leave the version out and the server uses the latest release.
• Add "version": "1.2.3" to pin a specific release, which is what you want if an update breaks your setup.
• Commas go between entries, never after the last one.

3. Load a modded scenario

If the scenario itself comes from a mod, set scenarioId to the scenario from that mod and make sure the mod is in the list. A modded scenario ID with the mod missing gives you a server that starts and loads nothing.

4. Start and watch

1. Start the server.
2. The Console shows each mod being downloaded and then loaded. The first start after adding a large mod takes several minutes.
3. A mod that fails to download is reported by ID. Check the ID against the Workshop page.

5. What your players do

Nothing in advance. Clients download the mod set from the server when they join, so the first connection is slow and later ones are quick. Tell your group to let the download finish rather than cancelling it, which is what makes it look like the server refused them.

If a mod keeps failing, remove it from the array, confirm the server boots, then add it back on its own so you know which one it is.