A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML (by jcrist)

Msgspec Alternatives

Similar projects and alternatives to msgspec

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better msgspec alternative or higher similarity.

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msgspec reviews and mentions

Posts with mentions or reviews of msgspec. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-11-01.
  • Htmx, Rust and Shuttle: A New Rapid Prototyping Stack
    3 projects | | 1 Nov 2023
  • Litestar 2.0
    4 projects | /r/Python | 29 Aug 2023
    Full support for validation and serialisation of attrs classes and msgspec Structs. Where previously only Pydantic models and types where supported, you can now mix and match any of these three libraries. In addition to this, adding support for another modelling library has been greatly simplified with the new plugin architecture
  • FastAPI 0.100.0:Release Notes
    12 projects | | 7 Jul 2023
    > Maybe it was very slow before

    That is at least partly the case. I maintain msgspec[1], another Python JSON validation library. Pydantic V1 was ~100x slower at encoding/decoding/validating JSON than msgspec, which was more a testament to Pydantic's performance issues than msgspec's speed. Pydantic V2 is definitely faster than V1, but it's still ~10x slower than msgspec, and up to 2x slower than other pure-python implementations like mashumaro.

    Recent benchmark here:


  • Pydantic 2.0
    2 projects | | 30 Jun 2023
    While it's definitely much faster than pydantic V1 (which is a huge accomplishment!), it's still not exactly what I'd call "fast".

    I maintain msgspec (, a serialization/validation library which provides similar functionality to pydantic. Recent benchmarks of pydantic V2 against msgspec show msgspec is still 15-30x faster at JSON encoding, and 6-15x faster at JSON decoding/validating.

    Benchmark (and conversation with Samuel) here:

    This is not to diminish the work of the pydantic team! For many users pydantic will be more than fast enough, and is definitely a more feature-filled tool. It's a good library, and people will be happy using it! But pydantic is not the only tool in this space, and rubbing some rust on it doesn't necessarily make it "fast".

  • Need help developing a high performance Redis ORM for Python
    2 projects | /r/Python | 23 May 2023 so I am using this instead of Pydantic.
  • Blog post: Writing Python like itโ€™s Rust
    2 projects | /r/Python | 20 May 2023
    Another thing: why pyserde rather than stuff like msgspec?
  • Show HN: Msgspec, a fast serialization/validation library for Python
    1 project | | 11 May 2023
  • [Guide] A Tour Through the Python Framework Galaxy: Discovering the Stars
    14 projects | /r/coder_corner | 29 Apr 2023
    Try msgspec | Maat | turbo for fast serialization and validation
  • Pydantic V2 rewritten in Rust is 5-50x faster than Pydantic V1
    3 projects | | 8 Apr 2023
    Congratulations to the team, Pydantic is an amazing library.

    If you find JSON serialization/deserialization a bottleneck, another interesting library (with much less features) for Python is msgspec:

  • Starlite updates March '22 | 2.0 is coming
    14 projects | /r/Python | 26 Mar 2023
    This feature is yet to be released, but it will allow you to seamlessly use data modelled with for example Pydantic, SQLAlchemy, msgspec or dataclasses in your route handlers, without the need for an intermediary model; The conversion will be handled by the specific DTO "backend" implementation. This new paradigm also makes it trivial to add support for any such modelling library, by simply implementing an appropriate backend.
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