Mod mismatch or missing mods when joining

Joining my modded server says mods are missing or mismatched.

Every player needs the same modpack (same mods and versions) as the server.

Before you start: The modpack name and version the server uses.

Step by step

1. Read the error: it lists the missing or mismatched mods.
2. Install the same modpack and version in CurseForge/Modrinth/Prism, and launch that profile.
3. If you added mods to the server yourself, add the same jars to every client (except server-only mods).
4. Make sure the loader version (Forge/Fabric) matches as well.
5. After updating the server pack, tell players to update their pack too.
6. Put the pack name and version in the MOTD or your Discord so new players install the right one.

Check it worked: Players join without a mod error.

Why it happens: Forge/NeoForge/Fabric check that the client and server mod lists match.

More guides on Joining and connection problems:

• Find your server address and connect
• Connection refused
• Connection timed out or server shows offline in the list
• Outdated client or outdated server
• Failed to verify username or invalid session
• Not whitelisted or banned from your own server