How to Create Custom Datapacks & Advancements in Minecraft 26.x (26.1/26.2)

Datapacks allow map makers and server admins to customize Minecraft mechanics without installing heavy server mods or forge launchers. You can add custom recipes, loot tables, functions, and custom achievement popups!

Datapack Folder Structure

my_custom_pack/
├── pack.mcmeta
└── data/
    └── my_namespace/
        ├── advancements/
        │   └── slay_dragon.json
        └── functions/
            └── reward.mcfunction

Defining the pack.mcmeta File

In 1.21, the pack format for datapacks updated. Ensure your pack.mcmeta specifies format 65+ (Minecraft 26.x) for Minecraft 26.x compatibility. Generate valid mcmeta files instantly with our pack.mcmeta Generator.

Advancement Triggers

Advancements trigger on specific player actions, such as minecraft:player_killed_entity, minecraft:inventory_changed, or minecraft:location. You can attach a function reward to grant items or play sounds when unlocked.

Build custom JSON advancement trees with custom icons using our Advancement Generator!