fastapi

FastAPI framework, high performance, easy to learn, fast to code, ready for production

fastapi Permissive license MIT Active ★ 101,573 v0.141.1 released 2026-07-29

Install

fastapi on PyPI

pip

pip install fastapi

uv

uv add fastapi

poetry

poetry add fastapi

Package facts

License	MIT (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	low — pure-Python wheel
Runtime dependencies	5 — starlette, pydantic, typing-extensions, typing-inspection, annotated-doc
Maintenance	actively maintained — 15 days since the last release
Last repo commit	2026-08-12
First released	2018-12-08
Popularity	one of the 100 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: fastapi-0.141.1-py3-none-any.whl

Development Status :: 4 - BetaEnvironment :: Web EnvironmentFramework :: AsyncIOFramework :: FastAPIFramework :: PydanticFramework :: Pydantic :: 2Intended Audience :: DevelopersIntended Audience :: Information TechnologyIntended Audience :: System AdministratorsOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: InternetTopic :: Internet :: WWW/HTTPTopic :: Internet :: WWW/HTTP :: HTTP ServersTopic :: Software DevelopmentTopic :: Software Development :: LibrariesTopic :: Software Development :: Libraries :: Application FrameworksTopic :: Software Development :: Libraries :: Python ModulesTyping :: Typed

About fastapi

from the package's own PyPI description — quoted content, verbatim

<a href="https://fastapi.tiangolo.com"><img src="https://fastapi.tiangolo.com/img/logo-margin/logo-teal.png" alt="FastAPI"></a> FastAPI framework, high performance, easy to learn, fast to code, ready for production <a href="https://github.com/fastapi/fastapi/actions?query=workflow%3ATest+event%3Apush+branch%3Amaster"> <img src="https://github.com/fastapi/fastapi/actions/workflows/test.yml/badge.svg?event=push&branch=master" alt="Test"> </a> <a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/fastapi/fastapi"> <img src="https://coverage-badge.samuelcolvin.workers.dev/fastapi/fastapi.svg" alt="Coverage"> </a> <a href="https://pypi.org/project/fastapi"> <img src="https://img.shields.io/pypi/v/fastapi?color=%2334D058&label=pypi%20package" alt="Package version"> </a> <a href="https://pypi.org/project/fastapi"> <img src="https://img.shields.io/pypi/pyversions/fastapi.svg?color=%2334D058" alt="Supported Python versions"> </a>

Documentation: https://fastapi.tiangolo.com

Source Code:...

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AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

FastAPI is a modern Python web framework for building high-performance APIs using standard type hints, with automatic interactive documentation and built-in validation via Pydantic.

Low install friction with a pure-Python wheel distribution. Active maintenance with a recent release 15 days ago and strong repository activity. Requires Python 3.10 or later.

MIT license permits broad use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.

Usage

pip install fastapi

from fastapi import FastAPI
app = FastAPI()

@app.get("/")
def read_root():
    return {"message": "Hello World"}

Requires Python 3.10 or later; an ASGI server is needed to run the application in production.

Verdict: FastAPI is actively maintained with zero known vulnerabilities and permissive MIT licensing. Its integration with Pydantic and Starlette provides runtime validation and async support with low install friction, making it production-ready for building modern Python APIs.

Needs verification

Whether all five runtime dependencies (starlette, pydantic, typing-extensions, typing-inspection, annotated-doc) are strictly required or if some are optional.
Performance characteristics relative to other async Python frameworks in real-world deployments.
Community adoption rate and ecosystem maturity beyond repository metrics.

python api frameworkfast async web serverrest api with type hintsopenapi automatic documentationpydantic validation frameworkhigh performance python apisasync python web framework