FastAPI

FastAPI#

FastAPI is a high-performance web framework for building APIs with Python 3.7+ based on standard Python type hints. It combines the simplicity of Flask with the performance of Node.js and Go, making it one of the fastest Python frameworks available.

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Key Features#

  • Fast: Extremely high performance, on par with NodeJS and Go

  • Intuitive: Great editor support with autocompletion

  • Easy: Designed to be easy to use and learn

  • Validated: Automatic request validation using Python type hints

  • Standards-based: Based on OpenAPI and JSON Schema standards

  • Automatic docs: Interactive API documentation generated automatically

Quick Start#

from fastapi import FastAPI

app = FastAPI()

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

@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "q": q}

Run with Uvicorn:

pip install fastapi uvicorn
uvicorn main:app --reload

Visit http://127.0.0.1:8000/docs for interactive API documentation.

FastAPI’s combination of speed, simplicity, and automatic validation makes it an excellent choice for modern API development, especially for developers who value type safety and documentation.

Resources#