msgspec

A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML.

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Project description

msgspec is a fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML. It features:

🚀 High performance encoders/decoders for common protocols. The JSON and MessagePack implementations regularly benchmark as the fastest options for Python.
🎉 Support for a wide variety of Python types. Additional types may be supported through extensions.
🔍 Zero-cost schema validation using familiar Python type annotations. In benchmarks msgspec decodes and validates JSON faster than orjson can decode it alone.
✨ A speedy Struct type for representing structured data. If you already use dataclasses or attrs, structs should feel familiar. However, they're 5-60x faster for common operations.

All of this is included in a lightweight library with no required dependencies.

msgspec may be used for serialization alone, as a faster JSON or MessagePack library. For the greatest benefit though, we recommend using msgspec to handle the full serialization & validation workflow:

Define your message schemas using standard Python type annotations.

>>> import msgspec

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

Encode messages as JSON, or one of the many other supported protocols.

>>> 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 objects, 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.ValidationError: 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 ~10-80x faster than alternative libraries.

See the documentation for more information.

LICENSE

New BSD. See the License File.

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This version

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

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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msgspec 0.18.6

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