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Top 23 Python Validation Projects
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The solution? Leverage Pydantic, a Python library that enables runtime data validation using type annotations.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Project mention: Generative AI: A Personal Deep Dive – My Notes and Insights Part-2 | dev.to | 2024-12-21
For those looking for an even easier way to manage structured outputs, the Instructor library is a fantastic tool. Instructor is built on top of Pydantic and aims to simplify the process of getting structured data like JSON from LLMs.
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marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
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msgspec
A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML
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].
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1: https://github.com/tidwall/gjson
2: https://jcristharif.com/msgspec/
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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webargs
A friendly library for parsing HTTP request arguments, with built-in support for popular web frameworks, including Flask, Django, Bottle, Tornado, Pyramid, webapp2, Falcon, and aiohttp.
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Deal
🤝 Design by contract for Python. Write bug-free code. Add a few decorators, get static analysis and tests for free.
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fastopenapi
FastOpenAPI is a library for generating and integrating OpenAPI schemas using Pydantic v2 and various frameworks (AioHttp, Falcon, Flask, Quart, Sanic, Starlette, Tornado).
Repository: GitHub
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openapi-spec-validator
OpenAPI Spec Validator is a CLI, pre-commit hook and python package that validates OpenAPI Specs against the OpenAPI 2.0 (aka Swagger), OpenAPI 3.0 and OpenAPI 3.1 specification.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Python Validation discussion
Python Validation related posts
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A Practical Guide on Structuring LLM Outputs with Pydantic
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Advanced Pydantic: Generic Models, Custom Types, and Performance Tricks
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Exploring the Instructor Library: Structuring Unstructured Data (and Some Fun along the Way)
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Tactics for multi-step LLM app experimentation
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Checkbox Extraction from PDFs - A Tutorial
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Table Extraction and Processing from PDFs - A Tutorial
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JSON extra uses orjson instead of ujson
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A note from our sponsor - InfluxDB
www.influxdata.com | 17 Jun 2025
Index
What are some of the best open-source Validation projects in Python? This list will help you:
# | Project | Stars |
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1 | pydantic | 24,143 |
2 | instructor | 10,732 |
3 | marshmallow | 7,150 |
4 | jsonschema | 4,772 |
5 | pandera | 3,854 |
6 | msgspec | 2,935 |
7 | Schematics | 2,580 |
8 | pydantic-core | 1,607 |
9 | strictyaml | 1,546 |
10 | WTForms | 1,545 |
11 | webargs | 1,395 |
12 | python-email-validator | 1,269 |
13 | Deal | 804 |
14 | enforce | 545 |
15 | colander | 457 |
16 | fastopenapi | 416 |
17 | flask-pydantic | 392 |
18 | openapi-spec-validator | 359 |
19 | pydantic-to-typescript | 355 |
20 | apischema | 234 |
21 | aiohttp-apispec | 220 |
22 | phantom-types | 219 |
23 | koda-validate | 119 |