Minecraft Mods & Modpacks

Forge, Fabric, NeoForge and Quilt, installing modpacks, the hybrid server software, and why modded servers behave differently.

All 30 guides

"Request failed with status code 500" / 403 when installing a mod — how do I fix it?
Are mods client-side or server-side — do players need them too?
Can I add mods after the server has started, or will it crash?
Can I add mods to a Bedrock server?
Can I run mods and plugins on the same server, and how?
Can crossplay work with mods and plugins together?
Can you install the modpack for me?
Do you support Quilt / how do I install it?
Does modpack install work the same for Fabric packs?
How do I install a mod manually or from CurseForge when it's not in the list?
How do I install a modpack that's not in the list, or a custom/self-made pack?
How do I install a modpack?
How do I install mods?
How do I manually install Forge or Fabric (installer, server.jar naming)?
How do I move files, mods, and world between two of my servers?
How do I run a custom or unlisted JAR (Waterfall, Velocity, Magma, a specific fork)?
How do I safely edit server.properties (e.g. a missing online-mode line)?
How do I set someone's gamemode or give creative?
How many mods or plugins can N GB of RAM handle?
Mods need Forge/Fabric — how do I set that up first?
My mod count is high (200/300/600 mods) — is that too many?
My server won't start or crashes with a specific modpack — help?
On a hybrid, do plugins go in the plugins folder or the mods folder?
The online-mode line is missing, or the server stops when I set it false — how do I fix it?
What are Forge, Fabric, Spigot, Purpur, Mohist, Magma, Arclight — and which do I use?
What does a mod's dependencies question mean — what does mod X need?
Which CurseForge version do I join on for my modpack (e.g. ATM8)?
Which hybrid (Mohist / Magma / Arclight) is best?
Which loader/Forge version does modpack X need?
Which plan for a specific big modpack (ATM9, DawnCraft, SkyFactory, etc.)?

Modded servers are the most memory-hungry thing we host, and a modpack that will not start is usually short of RAM rather than broken. Our Supreme and Ultimate Minecraft plans are the ones sized for heavy modpacks.