ormsgpack is a fast MessagePack serialization library for Python derived from orjson, with native support for various Python types.

ormsgpack follows semantic versioning and supports CPython, PyPy and GraalPy.

Links:

• Repository
• Documentation

pip

pip install ormsgpack

uv

uv add ormsgpack

Installing from a source distribution requires Rust 1.88 or newer and maturin.

This is an example of serializing and deserializing an object:

>>> import ormsgpack, datetime, numpy
>>> event = {
...     "type": "put",
...     "time": datetime.datetime(1970, 1, 1),
...     "uid": 1,
...     "data": numpy.array([1, 2]),
... }
>>> ormsgpack.packb(event, option=ormsgpack.OPT_SERIALIZE_NUMPY)
b'\x84\xa4type\xa3put\xa4time\xb31970-01-01T00:00:00\xa3uid\x01\xa4data\x92\x01\x02'
>>> ormsgpack.unpackb(_)
{'type': 'put', 'time': '1970-01-01T00:00:00', 'uid': 1, 'data': [1, 2]}

orjson was written by ijl <[email protected]>, copyright 2018 - 2021, licensed under both the Apache License, Version 2.0, and the MIT License.

ormsgpack was forked from orjson by Aviram Hassan and is now maintained by Emanuele Giaquinta (@exg), licensed under both the Apache License, Version 2.0, and the MIT License.