Are mods client-side or server-side — do players need them too?

A common source of "connection failed" confusion is whether players need the same mods as the server. The answer depends on the type of mod — here's how to tell.

Client-side, server-side, or both

• Most gameplay mods are both: the server runs them and each player must install the same mods (and versions) in their launcher, or they'll be kicked with a mismatch.
• Server-side only: many performance/utility mods — these don't need to be on the client.
• Client-side only: shaders, minimaps — these don't need to match the server.

Keeping players in sync

1. Note which of your mods are gameplay mods (usually both).
2. Give players the exact modpack or mod list you run, matching versions.
3. Leave server-only performance mods off the players' list.
4. Client-only mods (shaders, minimaps) are each player's own choice.

Tip: When in doubt, hand players the exact modpack you run — matching mods and versions avoids the "mismatch" kick.

Frequently asked questions

Do players need every mod I have? For gameplay mods, yes — matching versions. Server-side-only and client-side-only mods don't need to match.

Why do players get kicked with a mismatch? They're missing a required gameplay mod, or running a different version than the server.