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FastAPI & Uvicorn

2 min read

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Why FastAPI?

  • Modern & fast
    • Comparable to Node.js and Go
  • Easy to use
    • Automatic docs generation
  • Python 3.6+ type hints for better developer experience
  • Ideal for quickly building RESTful APIs

What is Uvicorn?

  • Uvicorn is a blazingly fast (🦀) ASGI (asynchronous server gateway interface) server that powers FastAPI application
  • Uvicorn possesses concurrency, designed to be fast and lightweight to support async web apps
  • We will be using Uvicorn as a server in which we will run FastAPI apps

What is Pydantic?

  • Pydantic allows us to create models that represent the structure of our data.
  • The models will automatically validate and parse the data coming into your application, making sure it fits the required types and constaints.
  • Very useful when a certain data type or structure is needed (such as JSON)

Basic API Endpoint

  • The structure of a FastAPI application is quite simple, with the key element being routes, which are functions that have decorators indicating what type of requests is being sent to the application:
from fastapi import FastAPI()
 
app = FastAPI()
 
@app.get("/")
async def read_root():
	return { "hello": "world" }

Running Your App

  • To run your app locally, you can run uvicorn main:app --reload in the workspace directory
    • main → file name without .py
    • app → FastAPI instance
    • --reload → auto-restart on code changes

Generated Documentation

  • FastAPI generates documentation automatically for your application
  • The documentation types can be accessible when the FastAPI app is running
    • Swagger UI → /docs
    • Redoc → /redoc

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