What is a .prefab.json file?

It is Hytale's prefab format — a JSON description of positioned blocks using Hytale's block names — that you can import into a Hytale project.

Does the .nbt need to be a structure file?

Yes. NBT is a general data format, so this converter expects a Java Edition structure file, such as one saved by a structure block.

Will every block have a Hytale match?

Common blocks map to a close Hytale equivalent. Blocks without a match are reported so you can review or replace them.

Does redstone or entity data carry over?

No. A prefab captures blocks and their positions, not functional block behavior or entities.

Convert .nbt to .prefab.json

Bring a Java structure-block .nbt build into Hytale. Bloxelizer reads the structure, maps the blocks to Hytale, and exports a .prefab.json prefab.

Free & unlimited

Runs in your browser

3D & layer previews

Drop a Minecraft schematic

orBrowse

We'll detect the format, let you view your build layer by layer in 2D / 3D, and let you export it to any format.

.schem

.litematic

.bp

.mcstructure

.nbt

.schematic

.mcstructurezip

.mcworld

.zip(Java world)

.prefab.json

.json

.glb

.gltf

.obj

.mtl

.stl

.bbmodel

.geo.json

.png

.jpg

.jpeg

.webp

Or paste a URL

The .nbt and .prefab.json formats

A structure-block .nbt file is Java Edition's structure format — a block-state palette and positioned blocks. A Hytale .prefab.json is Hytale's prefab format: a JSON list of positioned blocks referencing Hytale's block names. The conversion maps the structure's Minecraft blocks to their closest Hytale equivalents and writes a prefab for a Hytale project.

How to convert .nbt to .prefab.json

Select the Java structure block's .nbt file.

Check the Hytale block mapping in the 3D or layer preview.

Keep .prefab.json selected and download the Hytale prefab.

When to use this conversion

Use this route to move a vanilla Minecraft structure into a Hytale build or map project as a reusable prefab.

Compatibility notes

Minecraft and Hytale have different block sets, so each block maps to the closest Hytale match and some may have no exact equivalent. Review the preview and the missing-block report before using the prefab.