How to install mods for Arma Reforger

In order to install a mod you need its ModID, Name and Version.
You can find all this on the site of the mod on the Arma Reforger Workshop.

Once you have added mods to the configfile of the server, the server will download all mods.
A seperate upload via FTP is not necessary.

Important: Your server must be in Advanced Mode to add mods and you then need to stay in that mode or changes are reverted!

Add mods in config.json

When in Advanced Mode find the following section in config.json

"mods": []

Mods are added like this. You can find all the necessary information on the page of the mod.

"mods": [
    {
        "modId": "591AF5BDA9F7CE8B",
        "name": "Capture & Hold",
        "version": "1.0.3"
    }
]

Multiple mods are added like this:

"mods": [
    {
        "modId": "591AF5BDA9F7CE8B",
        "name": "Capture & Hold",
        "version": "1.0.3"
    },
    {
        "modId": "5614E481506D2979",
        "name": "Sample Mod - New Weapon",
        "version": "1.0.4"
    },
    {
        "modId": "5614E482BF83E310",
        "name": "Sample Mod - New Car",
        "version": "1.0.5"
    }
]

You need to adhere to the JSon syntax or the server will crash on startup.
You can have the syntax checked for correctness on sites like JSONLint.
Copy and paste your config here, the site will then point out errors.