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Declarative schemas
Describe a layout with a plain object and concise field strings such as u32le, f64be, or utf8[32].
xStructBinary serialization for TypeScript
Define a schema once, then serialize and deserialize Buffers with full type safety.
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Type-safe
Parameterize a struct with an interface and let TypeScript check the objects you encode and decode.
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Rich numeric types
8, 16, 32, and 64-bit integers (64-bit as bigint) plus single and double floats, each with explicit endianness.
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Strings and arrays
Fixed-size strings, multi-dimensional arrays, and variable-length text stored on the heap behind a pointer.
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Heap pointers
Variable-length fields live in a heap region behind a pointer, with a configurable 1, 2, 4, 6, or 8-byte pointer size.
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Bitfields and unions
Pack sub-byte fields into a shared container, and overlap members at offset 0 with a union.