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Top 23 Python Pydantic Projects
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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Project mention: I built binary serializer for Pydantic models that's up to 7× smaller than JSON | news.ycombinator.com | 2025-10-25
Found in issue where maintainer answered that they are only going to support JSON
https://github.com/pydantic/pydantic/discussions/4097
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an SQLModel entity backed by a database table doesn't validate its fields on creation, which is the point of Pydantic.
https://github.com/fastapi/sqlmodel/issues/52#issuecomment-1...
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Project mention: Structured Outputs on the Claude Developer Platform (API) | news.ycombinator.com | 2025-11-14
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Project mention: Show HN: Next.js-like Python web framework, built for Htmx with FastAPI | news.ycombinator.com | 2025-10-01
Would be cool if it was opiniated with ready to use and interactive components like in FastUI (https://github.com/pydantic/FastUI)
If you do this, i'll use it. But maybe that's not the goal?
That’s how I like to use them framework to quickly bootstrap a project in Python only.
I've started working on a FastAPI with HTMX wrapper also 4 days ago, it's not as advanced as your projects tho. There's not much there yet, but here's the link: https://github.com/lakonguina/devanture
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If you're looking for a mixture of the two, there's Django Ninja: https://django-ninja.dev
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Project mention: Hyperflask – Full stack Flask and Htmx framework | news.ycombinator.com | 2025-10-16
A lot of people in this thread mentioning the limitations of Flask and “why not FastAPI” etc - but I’ve found Litestar to be the best alternative and it has htmx support out of the box.
https://litestar.dev/
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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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datamodel-code-generator
Pydantic model and dataclasses.dataclass generator for easy conversion of JSON, OpenAPI, JSON Schema, and YAML data sources.
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tracecat
All-in-one AI automation platform (workflows, agents, cases, tables) for security, IT, and infra teams.
Project mention: N8n added native persistent storage with DataTables | news.ycombinator.com | 2025-10-02 -
opyrator
🪄 Turns your machine learning code into microservices with web API, interactive GUI, and more.
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uvicorn-gunicorn-fastapi-docker
Docker image with Uvicorn managed by Gunicorn for high-performance FastAPI web applications in Python with performance auto-tuning.
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#!/usr/bin/env -S uv run --script # /// script # requires-python = ">=3.10" # dependencies = [ # "fire", # "magentic", # "pydantic", # ] # /// from fire import Fire from magentic import chatprompt, AssistantMessage, SystemMessage, UserMessage from pydantic import BaseModel # this is a modified version of magentic's example chatprompt code # https://magentic.dev/#chatprompt class Quote(BaseModel): quote: str character: str @chatprompt( SystemMessage("You are a movie buff."), UserMessage("What is your favorite quote from Harry Potter?"), AssistantMessage( Quote( quote="It does not do to dwell on dreams and forget to live.", character="Albus Dumbledore", ) ), UserMessage("What is your favorite quote from {movie}?"), ) def get_movie_quote(movie: str) -> Quote: ... if __name__=="__main__": Fire(get_movie_quote)
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fastcrud
FastCRUD is a Python package for FastAPI, offering robust async CRUD operations and flexible endpoint creation utilities.
fastcrud - CRUD operations for FastAPI
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pydantic-settings – Settings management using pydantic
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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 Pydantic discussion
Python Pydantic related posts
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Structured Outputs on the Claude Developer Platform (API)
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Show HN: rstructor, Pydantic+instructor for Rust
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Hyperflask – Full stack Flask and Htmx framework
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Show HN: Next.js-like Python web framework, built for Htmx with FastAPI
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Build a Frontend for your ADK Agents with AG-UI
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Structured Outputs in LLMs
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Building Production-Ready AI Agents with Pydantic AI and Amazon Bedrock AgentCore
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A note from our sponsor - SaaSHub
www.saashub.com | 16 Nov 2025
Index
What are some of the best open-source Pydantic projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | fastapi | 91,739 |
| 2 | pydantic | 25,768 |
| 3 | sqlmodel | 17,122 |
| 4 | pydantic-ai | 13,287 |
| 5 | FastUI | 8,907 |
| 6 | django-ninja | 8,696 |
| 7 | litestar | 7,636 |
| 8 | logfire | 3,751 |
| 9 | datamodel-code-generator | 3,579 |
| 10 | vizro | 3,469 |
| 11 | rocketry | 3,361 |
| 12 | tracecat | 3,341 |
| 13 | opyrator | 3,135 |
| 14 | docarray | 3,110 |
| 15 | uvicorn-gunicorn-fastapi-docker | 2,810 |
| 16 | beanie | 2,489 |
| 17 | magentic | 2,379 |
| 18 | ormar | 1,781 |
| 19 | pydantic-core | 1,722 |
| 20 | fastcrud | 1,384 |
| 21 | polyfactory | 1,333 |
| 22 | redis-om-python | 1,269 |
| 23 | pydantic-settings | 1,141 |
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Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
getstream.io