pydantic
Data validation using Python type hints (by pydantic)
Construct
Construct: Declarative data structures for python that allow symmetric parsing and building (by construct)
| pydantic | Construct | |
|---|---|---|
| 183 | 5 | |
| 26,209 | 988 | |
| 2.3% | 0.8% | |
| 9.8 | 2.7 | |
| 5 days ago | 8 months ago | |
| Python | Python | |
| MIT License | GNU General Public License v3.0 or later |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
pydantic
Posts with mentions or reviews of pydantic. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2025-11-16.
- Python Design Patterns for Clean Architecture
Pydantic Documentation
- I built binary serializer for Pydantic models that's up to 7× smaller than JSON
Found in issue where maintainer answered that they are only going to support JSON
https://github.com/pydantic/pydantic/discussions/4097
- Dict Unpacking in Python
- A Practical Guide on Structuring LLM Outputs with Pydantic
The solution? Leverage Pydantic, a Python library that enables runtime data validation using type annotations.
- Loading Pydantic models from JSON without running out of memory
Pydantic author here. We have plans for an improvement to pydantic where JSON is parsed iteratively, which will make way for reading a file as we parse it. Details in https://github.com/pydantic/pydantic/issues/10032.
Our JSON parser, jiter (https://github.com/pydantic/jiter) already supports iterative parsing, so it's "just" a matter of solving the lifetimes in pydantic-core to validate as we parse.
This should make pydantic around 3x faster at parsing JSON and significantly reduce the memory overhead.
- Advanced Pydantic: Generic Models, Custom Types, and Performance Tricks
Across this five-post series, we’ve journeyed from Pydantic’s basics—type validation and nested models—to advanced integrations with FastAPI, SQLAlchemy, and scalable techniques. You’ve learned how to build declarative, type-safe models, handle complex APIs, and optimize performance. To deepen your knowledge, explore the Pydantic documentation, contribute to the open-source project, or experiment with real-world use cases. Check out our GitHub repo for code samples and a Pydantic cheat sheet. Thank you for joining us—happy coding!
- Getting Started with Pydantic: Type-Safe Data Models in Python
To dive deeper, check out the Pydantic documentation for advanced features like nested models, custom validators, and settings management. Happy coding!
- Resumindo características da linguagem Python
- FastAPI, Pydantic, Psycopg3: the holy trinity for Python web APIs
Pydantic is bundled with FastAPI and is excellent for modelling, validating, and serialising API responses.
- Pydantic Settings + AWS the easy way
Pydantic Settings is a python library that extends 🚀 Pydantic for dealing with settings management.
Construct
Posts with mentions or reviews of Construct. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-01-18.
- MPK mini MK3 not working
- In need of assistance with mungewell’s zoom_fx
- Which not so well known Python packages do you like to use on a regular basis and why?
Construct is really useful for writing parsers/builders for binary protocols.
- Converting G1XFour patches to G1Four?
- Binary serialization library for at least C++17?
I myself am looking for a binary serializer/deserializer that's like construct in python or construct-js, but obviously I wouldn't need some of the types that they have, since C++ already has them.
What are some alternatives?
When comparing pydantic and Construct you can also consider the following projects:
msgspec - A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML
Lark - Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity.
pyparsing - Python library for creating PEG parsers
Atoma - Atom, RSS and JSON feed parser for Python 3
typeguard - Run-time type checker for Python
PLY - Python Lex-Yacc