Minecraft Java Edition 26.1.2 · Pack Format 101.1

Cobble

A modern, Python-like language for creating Minecraft data packs with functions, events, resources, validation, and generated metadata.

0.9.0 stable · Minecraft Java Edition 26.1.2

Open compiler Source

Readable sourceIndentation, functions, imports, and thin helper APIs.

Real data packsFunctions, pack metadata, tags, predicates, dialogs, and JSON.

Validation pathGenerated commands can be checked against Minecraft's command tree.

Browser exportDownload generated files or a data pack ZIP from `/try`.

Examples

Write data pack logic directly

Cobble stays close to Minecraft output while removing repetitive function and resource boilerplate.

Load Events

import stdlib
from stdlib import event

def on_load():
    text.tellraw("@a", text.colored("Ready", "green"))

stdlib.addEventListener(event.LOAD, on_load)

Modern Items

def reward(player):
    /give {player} minecraft:diamond_sword[
        minecraft:custom_name='{"text":"Cobble Blade"}'
    ] 1

Data Pack Resources

from stdlib import datapack

datapack.function_tag("minecraft:load", ["demo:on_load"])
datapack.predicate("checks/always", {
    "condition": "minecraft:random_chance",
    "chance": 1
})

In Browser

Try the compiler when you are ready to inspect output.

The Rust parser and transpiler run through WebAssembly. The compiler view shows functions, resources, metadata, diagnostics, and ZIP output.

Go to /try