fastnbt crate

Documentation: docs.rs

Fast deserializer and parser for Minecraft: Java Edition's NBT format.

Includes

• a serde based deserializer for NBT for deserialization.
• a lower level parser using the Read trait.

The derserializer allows you to avoid allocations where possible. Strings can be deserialized to &'a str where 'a is the lifetime of the data being deserialized. The borrow module contains more types for avoiding allocations.

See the documentation for more information.

toml [dependencies] fastnbt = "1"

Comparison to other NBT crates

There are other crates for NBT out there, this tries to give an honest comparison to them. The Hemtite nbt crate was the only other crate I found with serde deserialization.

| Feature | fastnbt | Hematite nbt | note | | ------- | --------- | -------------- | ---- | | Benchmark world render time (relative)* | 1.00 | 1.37 | fastnbt is ~37% faster. See note. | | Deserialization | yes | yes | | | Serialization | no | yes | | | Value-like type | yes | yes | | | Long Array (MC 1.12+) | yes | yes | | | Minecraft specialized unicode | no** | yes | | | Deserialize from reader | no | yes | | | WASM compatible | yes | unknown | |

* This is rendering the overworld of Etho's Lets Play Episode 550. Exact relative figures are 1000±13 for fastnbt and 1370±7 for hematite-nbt. This used the anvil tiles executable, swapping out the deserializer only, so performance tweaks in rendering chunks are not counted.

**intended feature