fastnbt crate

Documentation: docs.rs

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

Includes a Value type for serializing or deserializing any NBT. Value correctly preserves the exact NBT structure.

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 = "2"

fastnbt follows Semver, some things that this project does not count as a breaking change are:

• Minimum Rust version change. Outside of corporate environments this should not be too difficult, and I don't see much need for NBT in those environments.
• Improving the (de)serializer such that valid NBT that did not (de)serialize, then (de)serializes. Any of these cases I consider a bug.
• Data format when serializing types from fastnbt/fastanvil to other formats. Types in fastnbt implement serde::Serialise to enable spitting out to other data formats, but may change structure in future.

Changes that make fastnbt incompatible with WebAssembly are considered breaking changes.

Comparison to other NBT crates

There are other crates for NBT out there, this tries to give an honest comparison to them.

The Hematite nbt crate was the only other crate I found with serde deserialization.

• Both crates support serialization and deserialization with serde.
• They are not interoperable due to requiring custom handling of NBT Array types.
• They both handle Minecraft's (actually Java's) specialised Unicode.
• fastnbt supports borrowing from the underlying bytes being deserialized.
• fastnbt's Value type can round-trip deserialize-serialize NBT arrays.