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Top 23 Python Openapi3 Projects
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The most sophisticated approach uses type hints and models to automatically generate documentation. FastAPI is the poster child here - it introspects your Pydantic models and function signatures to build comprehensive OpenAPI specs with minimal manual input.
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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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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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Solutions to this problem generate API documentation automatically. Libraries such as drf-spectacular use code structure and semantics in back-end frameworks to infer API contracts. API frameworks such as FastAPI and Huma generate OpenAPI specifications as a built-in feature. Tools like mitmproxy2swagger generate documentation from HAR files. Finally, companies such as Akita Software/Postman use network traffic metadata.
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Project mention: openapi-python-client VS lapidary-render - a user suggested alternative | libhunt.com/r/openapi-python-client | 2025-03-16
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apispec
A pluggable API specification generator. Currently supports the OpenAPI Specification (f.k.a. the Swagger specification)..
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InfluxDB
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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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openapi-schema-validator
OpenAPI schema validator is a Python library that validates schema against OpenAPI Schema Specification v3.0 and v3.1
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Extensions Required:pyramid_openapi3 is the latest extension, while others use Yelp's pyramid_swagger. If you use cornice to build APIs on top of Pyramid, you can use the cornice-swagger extension to add OpenAPI support.
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Project mention: Uplink VS lapidary - a user suggested alternative | libhunt.com/r/uplink | 2025-03-16
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openapi-type
OpenAPI represented as a Python type. Use it to parse specifications written in JSON and YAML formats.
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Project mention: Show HN: FastOpenAPI – automated docs for many Python frameworks | news.ycombinator.com | 2025-03-22
That's really neat! I made a project for fastapi-like dependency injection for AioHTTP and it also has OpenAPI spec generation. If I could, I would like to use your library for specs instead of self-written solution.
Here's my project repo: https://github.com/taskiq-python/aiohttp-deps
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azure-functions-openapi
Python library to auto-generate Swagger (OpenAPI 3) docs for Azure Functions using decorators and Pydantic models.
Project mention: FastAPI-Style Swagger UI for Azure Functions in Python (OpenAPI + Pydantic) | dev.to | 2025-05-25All the code is open-source here: 👉 https://github.com/yeongseon/azure-functions-openapi
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Project mention: openapi-generator VS lapidary-render - a user suggested alternative | libhunt.com/r/openapi-generator | 2025-03-16
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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 Openapi3 discussion
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A note from our sponsor - SaaSHub
www.saashub.com | 1 Sep 2025
Index
What are some of the best open-source Openapi3 projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | fastapi | 88,756 |
| 2 | msgspec | 3,110 |
| 3 | uvicorn-gunicorn-fastapi-docker | 2,796 |
| 4 | Schemathesis | 2,693 |
| 5 | drf-spectacular | 2,677 |
| 6 | openapi-python-client | 1,663 |
| 7 | apispec | 1,203 |
| 8 | apiflask | 1,100 |
| 9 | fastopenapi | 427 |
| 10 | safrs | 411 |
| 11 | openapi-spec-validator | 371 |
| 12 | openapi-schema-validator | 115 |
| 13 | pyramid_openapi3 | 83 |
| 14 | requests-openapi | 63 |
| 15 | OpenAlchemy | 48 |
| 16 | http-rider | 31 |
| 17 | cloudedbats_wurb_2020 | 21 |
| 18 | lapidary | 14 |
| 19 | openapi-type | 11 |
| 20 | aiohttp-deps | 11 |
| 21 | azure-functions-openapi | 9 |
| 22 | odootools-openapi | 7 |
| 23 | lapidary-render | 3 |
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