fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Decision gist · record as of 2026-08-14
Yes. FastAPI is actively maintained, has no known vulnerabilities, installs with low friction, uses a permissive MIT license, and is ranked in the top 100 PyPI packages by downloads. It is production-ready and well-suited for building REST APIs in Python when you want automatic validation, documentation, and type safety without significant overhead.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later; a running ASGI server (such as Uvicorn) is needed to serve the application.
- Low friction install with only 5 runtime dependencies.
- Actively maintained with recent releases; repository shows 101579 stars and last commit on 2026-08-12, indicating strong ongoing development and community support.
License · maintenance · safety
MIT (permissive) — MIT license permits use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.
last release 2026-07-29 (16 days) · last repo commit 2026-08-12 · 101,579 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 568,552,369 downloads/mo, #63 on PyPI
Alternatives
Verify before relying
pip install fastapi
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
def read_root():
return {"Hello": "World"}- Performance benchmarks comparing FastAPI to NodeJS and Go are cited in the description but not independently verified in the fact sheet.
- Claimed development speed improvements (200-300%) and error reduction (40%) are attributed to internal testing and need external validation.
What it is and what it does
FastAPI is a modern web framework for building Python APIs that leverages type hints for automatic request validation, response serialization, and documentation. It combines Starlette for HTTP handling and Pydantic for data validation, allowing developers to define API endpoints with minimal boilerplate. The framework automatically generates interactive API documentation (Swagger UI and ReDoc) from your code and validates incoming requests against type annotations.
Typical use involves decorating functions with HTTP method decorators (@app.get, @app.post, etc.), declaring request/response models using Pydantic's BaseModel, and letting the framework handle validation, serialization, and documentation generation. It supports both synchronous and asynchronous endpoints, making it suitable for I/O-bound operations. The framework is production-ready and standards-based, generating OpenAPI schemas automatically.
Use it for
- Build REST APIs with automatic request validation and type-safe parameter handling using Python type hints.
- Create microservices that need interactive, auto-generated API documentation without manual specification.
- Develop async-first web services that handle concurrent requests efficiently with async/await syntax.
- Prototype and deploy data APIs quickly with minimal code duplication through Pydantic model reuse.
- Integrate machine learning model serving endpoints with automatic input validation and schema generation.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
FastAPI is actively maintained, has no known vulnerabilities, installs with low friction, uses a permissive MIT license, and is ranked in the top 100 PyPI packages by downloads. It is production-ready and well-suited for building REST APIs in Python when you want automatic validation, documentation, and type safety without significant overhead.
Install
fastapi on PyPI
Before you install
Low friction install with only 5 runtime dependencies. Actively maintained with recent releases; repository shows 101579 stars and last commit on 2026-08-12, indicating strong ongoing development and community support.
Requires Python 3.10 or later; a running ASGI server (such as Uvicorn) is needed to serve the application.
License in practice
MIT license permits use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.
Quickstart
pip install fastapi
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
def read_root():
return {"Hello": "World"}Verify before relying
- Performance benchmarks comparing FastAPI to NodeJS and Go are cited in the description but not independently verified in the fact sheet.
- Claimed development speed improvements (200-300%) and error reduction (40%) are attributed to internal testing and need external validation.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 5 packagesstarlettepydantictyping-extensionstyping-inspectionannotated-doc |
| Maintenance | Actively maintained 16 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 568,552,369 / month, #63 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | 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 |
Evidence: fastapi-0.141.1-py3-none-any.whl
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See also fastapi-cli · fastapi-events · flask-openapi3 · fastapi-cloudevents · fastapi-slim · APIFlask · fastui · fastcrud · fastapi-offline · django-ninja