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Minecraft Datapack Item, Block & Function Tags Builder

Build Java item, block and function tags with nested references, optional entries and replacement control. Validate safe resource paths and export a correctly structured datapack ZIP.

FreeNo sign-upBrowser-basedJava 1.21.11 data

Your result

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Copy-ready output

How to use

Choose tag registry, add entries and edit required flags or nested #tag references. Set replace true only to replace lower-priority contributions.
Choose a safe namespace:path ID. Download JSON for the payload or ZIP for pack.mcmeta and versioned data directories. Install only in a world you control.

Examples

Item tag values stone and cobblestone

Both verified item IDs are included.

Optional function entry with required false

A missing referenced function does not fail tag loading.

Supported versions & limitations

Verified Java dataset: 1.21.11

Only supplied registry IDs are verified locally. Custom functions and nested tags are dependencies to include in your other files; they are listed in the result.
Java 1.21.11 data pack format 94.1 only. This website generates files locally and does not activate packs or run commands.

Frequently asked questions

Is the ZIP a real datapack?

Yes. It contains pack.mcmeta and the resource JSON in the singular Java 1.21.11 directory. ZIP integrity is checked independently.

How are generated files validated?

Fixtures pass the official offline Java 1.21.11 codecs. Unknown fields, invalid IDs, unsafe paths and oversized inputs are rejected; a live world is not simulated.

Sources

https://www.minecraft.net/en-us/article/minecraft-java-edition-1-21-11

Facts reviewed 2026-10-12. Supported scope and preview limitations are described above.