3. Modpacks

Ideally, you shouldn't include any client side only mods in the modpack folder for the server. Client side mods only affect the client (player) meaning they add zero new functionality to the game. Includes things like different textures, shaders, RPC, etc. Nothing bad should happen if you do but it's just best practice. Mods are included in the modpack folder so they do not need to be obtained manually.

1. In tModLoader on your client, enable any mods that you want to play with.
2. Go to the mod pack section.
3. "Save Enabled as New Mod Pack"
4. "Open Mod Pack folder"
5. Copy the folder of the modpack you want to use in the server and paste that into (ConfDir)/ModPacks/

Make sure the modpack has an enabled.json with the mods you want or else the server will not start.