Msgspec Alternatives

msgspec reviews and mentions

• Detect memory leaks of C extensions with psutil and psleak
  7 projects | news.ycombinator.com | 24 Dec 2025

  This is awesome, thanks a lot! I'm going to introduce this in the test suites of the extension modules I maintain [0][1] and, if all goes well, eventually at work [2].

  I really appreciate the support for Windows as that platform is currently underserved [3] when it comes to such memory tooling.

  [0]: https://github.com/jcrist/msgspec

• Don't let dicts spoil your code
  3 projects | news.ycombinator.com | 9 Oct 2024

  gjson [1] and a few other go packages offer a way to parse arbitrary JSON without requiring structs to hold them.

  re: Python. I like PyRight/PyLance for Python typing, it seems to "just work" afaict. I also like msgspec for dataclass like behavior [2].

  ---

  1: https://github.com/tidwall/gjson

  2: https://jcristharif.com/msgspec/

• Htmx, Rust and Shuttle: A New Rapid Prototyping Stack
  3 projects | news.ycombinator.com | 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 | news.ycombinator.com | 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: https://gist.github.com/jcrist/d62f450594164d284fbea957fd48b...

  [1]: https://github.com/jcrist/msgspec

• Pydantic 2.0
  2 projects | news.ycombinator.com | 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 (https://github.com/jcrist/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: https://gist.github.com/jcrist/d62f450594164d284fbea957fd48b...

  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

  https://github.com/jcrist/msgspec so I am using this instead of Pydantic.

• Blog post: Writing Python like it’s Rust
  2 projects | /r/Python | 20 May 2023

  Another thing: why pyserde rather than stuff like msgspec? https://github.com/jcrist/msgspec

• Show HN: Msgspec, a fast serialization/validation library for Python
  1 project | news.ycombinator.com | 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

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