msgspec

A fast and friendly JSON/MessagePack library, with optional schema validation

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Project description

msgspec is a fast and friendly serialization library for Python, supporting both JSON and MessagePack. It integrates well with Python’s type annotations, providing ergonomic (and performant!) schema validation.

Define your message schemas using standard Python type annotations.

>>> from typing import Optional, Set

>>> import msgspec

>>> class User(msgspec.Struct):
...     """A new type describing a User"""
...     name: str
...     groups: Set[str] = set()
...     email: Optional[str] = None

Encode messages as JSON or MessagePack.

>>> alice = User("alice", groups={"admin", "engineering"})

>>> alice
User(name='alice', groups={"admin", "engineering"}, email=None)

>>> msg = msgspec.json.encode(alice)

>>> msg
b'{"name":"alice","groups":["admin","engineering"],"email":null}'

Decode messages back into Python types (with optional schema validation).

>>> msgspec.json.decode(msg, type=User)
User(name='alice', groups={"admin", "engineering"}, email=None)

>>> msgspec.json.decode(b'{"name":"bob","groups":[123]}', type=User)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
msgspec.DecodeError: Expected `str`, got `int` - at `$.groups[0]`

msgspec is designed to be as performant as possible, while retaining some of the nicities of validation libraries like pydantic. For supported types, encoding/decoding a message with msgspec can be ~2-40x faster than alternative libraries.

https://github.com/jcrist/msgspec/raw/master/docs/source/_static/bench-1.png

See the documentation for more information.

LICENSE

New BSD. See the License File.

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Release history Release notifications | RSS feed

0.18.6

Jan 22, 2024

0.18.5

Dec 13, 2023

0.18.4

Oct 5, 2023

0.18.3

Oct 3, 2023

0.18.2

Aug 26, 2023

0.18.1

Aug 16, 2023

0.18.0

Aug 10, 2023

0.17.0

Jul 12, 2023

0.16.0

Jun 12, 2023

0.15.1

May 19, 2023

0.15.0

May 10, 2023

0.14.2

Apr 20, 2023

0.14.1

Apr 7, 2023

0.14.0

Apr 2, 2023

0.13.1

Feb 10, 2023

0.13.0 yanked

Feb 9, 2023

Reason this release was yanked:

Memory leak in JSON decoder

0.12.0

Jan 5, 2023

0.11.0

Dec 19, 2022

0.10.1

Dec 8, 2022

0.10.0

Dec 8, 2022

0.9.1

Oct 28, 2022

0.9.0

Sep 14, 2022

0.8.0

Aug 2, 2022

0.7.1

Jun 28, 2022

0.7.0

Jun 20, 2022

0.6.0

Apr 6, 2022

0.5.0

Mar 9, 2022

This version

0.4.2

Feb 28, 2022

0.4.1

Feb 23, 2022

0.4.0

Feb 8, 2022

0.3.2

Jul 23, 2021

0.3.1

Jul 13, 2021

0.3.0

Jul 7, 2021

0.2.0

Feb 25, 2021

0.1.0

Feb 23, 2021

0.0.1

Feb 23, 2021

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