FastAPI
Fast Python framework for building APIs with type hints
FreeFrameworkAPIOpen Source10 impressions
FastAPI is a modern Python web framework for building high-performance APIs using standard type hints.
- for
- Python developers building APIs and microservices
- pricing
- open source
- license
- MIT
Key features
- High performance — Runs at speeds comparable to NodeJS and Go using Starlette and Pydantic.
- Fast development — Reduces code writing time by 200-300% with automatic validation and docs.
- Automatic docs — Generates interactive Swagger UI and ReDoc documentation from code.
- Data validation — Validates request data and converts JSON to Python types using Pydantic.
- Dependency injection — Provides an easy-to-use DI system for managing resources and services.
- Security support — Built-in OAuth2, JWT, and HTTP Basic authentication helpers.
Use cases
- Create a RESTful service for a machine-learning model
- Build a microservice with automatic OpenAPI docs
- Develop a CRUD API with built-in data validation
- Implement OAuth2 protected endpoints for a SaaS product
FastAPI vs alternatives
 FastAPI |  Remix |  Django | |
|---|---|---|---|
| Best for | Fast, type-hinted Python APIs | Full-stack web apps with React | Full-stack Python web apps |
| Pricing | Open source | Free | Free |
| DevHunt upvotes | 0 | 0 | 0 |
| Launched | — | — | — |
- FastAPI vs Remix: Remix is a full-stack web framework built on web standards, whereas FastAPI focuses on Python APIs with type-hinted validation.
- FastAPI vs Django: Batteries-included Python web framework with ORM and admin; FastAPI is a lighter framework focused on typed APIs.
FastAPI FAQ
How do I install FastAPI?+
Install with uv using `uv add "fastapi[standard]"` or with pip via `pip install fastapi[standard]`.
What command runs a FastAPI app in development?+
Use `fastapi dev` which auto-detects the app, starts Uvicorn, and enables auto-reload.
Does FastAPI generate API documentation?+
Yes, it automatically creates OpenAPI specs and serves Swagger UI at `/docs` and ReDoc at `/redoc`.
How does FastAPI handle request data?+
It uses Pydantic models to validate and convert JSON, query, path, header, cookie, form, and file data.
Is FastAPI compatible with async code?+
Yes, you can define async route handlers and FastAPI will run them with async/await support.
What standards does FastAPI follow?+
It is fully compatible with OpenAPI (Swagger) and JSON Schema standards.
Summarized by DevHunt from fastapi.tiangolo.com · Oct 1, 2026. Details may change; check the official site.
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