Server & World Setup
How to Install a Datapack
Datapacks live inside the world foldernot the plugins or mods directory. Drop the .zip into world/datapacksrun /reloadand watch for "Loaded N data pack(s)". No restart, no client install, every player gets it the moment the server reloads.
server console, Minecraft 1.21
world/
datapacks/
vanilla_tweaks.zip ← drop here
> /reload▋
[Server thread/INFO]: Reloading ResourceManager: Default, vanilla_tweaks.zip
[Server thread/INFO]: Reloading data packs
[Server thread/INFO]: Found new data pack file/vanilla_tweaks.zip, loading it automatically
✔ Loaded 2 data pack(s)
Datapack vs. plugin vs. mod
A datapack changes the game using only vanilla mechanics, loot tables, recipes, functions, advancements, predicates. It needs no Bukkit/Spigot, no Forge, and nothing installed on the client. That makes it the safest way to add features to a vanilla Java world.
Because it is per-world, the same datapack must be placed in each world you want it on. Use /datapack list to see what is enabled (green) versus available (gray), and /datapack enable "file/<name>.zip" to toggle one on without touching the others. If a pack will not load, the console almost always tells you why, check it before re-downloading.
Quick answers
+Where exactly does the datapack go?
Inside the world folder: world/datapacks on a server, or .minecraft/saves/<WorldName>/datapacks in single-player. It is tied to that specific world, so each world needs its own copy.
+Do I unzip the datapack first?
No. Leave it as a .zip. Minecraft reads zipped datapacks directly. If you do unzip it, make sure pack.mcmeta is at the top level of the folder, not inside an extra nested folder.
+/reload did not load it. Why?
Most often the zip has a wrong structure (pack.mcmeta nested one level too deep), the wrong pack_format for your version, or it landed in the wrong world. Check the console for "Failed to find" or "incompatible" warnings and run /datapack list.
+What does pack_format mean?
It is a number in pack.mcmeta that maps to a game version range. A datapack built for an older pack_format may refuse to load on a newer Minecraft. Use a datapack made for your version, or edit pack.mcmeta if you know the format number.
+Can I add a datapack without a restart?
Yes, that is the whole point of /reload. Drop the zip in and run /reload. You only need a full restart if /reload itself is misbehaving or the pack changes things that require world reinitialization.
+How do I remove a datapack?
Run /datapack disable "file/vanilla_tweaks.zip" to turn it off, then delete the zip from world/datapacks and /reload. Some packs leave behind scoreboard objectives or tags you may want to clean up manually.