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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
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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 |
|---|---|---|
| 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 |
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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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