16 releases (1 stable)

1.0.0 Aug 17, 2021
0.4.7 Feb 2, 2021
0.4.6 Dec 6, 2020
0.4.5 Jul 24, 2020
0.3.4 Mar 26, 2017

#106 in Encoding

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21,242 downloads per month
Used in 42 crates (26 directly)

MIT license

4.5K SLoC

RMP - Rust MessagePack

RMP is a pure Rust MessagePack implementation.

Build Status Coverage Status

This repository consists of three separate crates: the RMP core and two implementations to ease serializing and deserializing Rust structs.

crates.io API Documentation
rmp RMP
rmps RMP Serde
rmpv RMP Value


  • Convenient API

    RMP is designed to be lightweight and straightforward. There are low-level API, which gives you full control on data encoding/decoding process and makes no heap allocations. On the other hand there are high-level API, which provides you convenient interface using Rust standard library and compiler reflection, allowing to encode/decode structures using derive attribute.

  • Zero-copy value decoding

    RMP allows to decode bytes from a buffer in a zero-copy manner easily and blazingly fast, while Rust static checks guarantees that the data will be valid as long as the buffer lives.

  • Clear error handling

    RMP's error system guarantees that you never receive an error enum with unreachable variant.

  • Robust and tested

    This project is developed using TDD and CI, so any found bugs will be fixed without breaking existing functionality.


  • Rust 1.34.2


This project adheres to Semantic Versioning. However until 1.0.0 comes there will be the following rules:

  • Any API/ABI breaking changes will be notified in the changelog explicitly and results in minor version bumping.
  • API extending features results in patch version bumping.
  • Non-breaking bug fixes and performance improving results in patch version bumping.