Features

Current Features

• Complete implementation of the MessagePack specification
• Designed to be safe, efficient, and extensible
• Modern interface-based API with JSpecify nullness annotations
• Embraces Java NIO
  • Heap and direct byte buffers
  • Buffer pooling
  • Channel transfers
  • Gathering writes
• Fast and safe string encoding/decoding
  • Malformed and unmappable characters are always replaced with \uFFFD
• Small JAR size (~70 KB)
• Ships as Java module (JPMS)
• No native code, reflection, or internal/unsafe JDK classes
• No dependencies other than JSpecify (~3 KB, optional)
• Compatible with GraalVM Native Image
• Thoroughly tested with jqwik
  • Tested against MessagePack's Java reference implementation
• Thoroughly benchmarked with JMH
  • Benchmarked against MessagePack's Java reference implementation

Planned Features

• Optimized handling of strings used as identifiers
• Optimized handling of maps used as objects
• Integration with jackson-databind
• Integration with kotlinx.serialization