Build a REST API in 10 Minutes with FastAPI and Python

#python #fastapi #beginners #webdev

Build a REST API in 10 Minutes with FastAPI and Python

FastAPI is the fastest way to build production-ready APIs in Python.

Setup

pip install fastapi uvicorn

Your First API

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):
    name: str
    price: float

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

@app.get("/items/{item_id}")
def read_item(item_id: int):
    return {"item_id": item_id}

@app.post("/items/")
def create_item(item: Item):
    return {"item": item, "status": "created"}

Run It

uvicorn main:app --reload

Visit http://localhost:8000/docs for automatic API documentation.

Add a Database

from fastapi import FastAPI
import sqlite3

app = FastAPI()

def get_db():
    conn = sqlite3.connect("data.db")
    conn.row_factory = sqlite3.Row
    return conn

@app.get("/products")
def list_products():
    db = get_db()
    rows = db.execute("SELECT * FROM products").fetchall()
    return [dict(r) for r in rows]

@app.post("/products")
def create_product(name: str, price: float):
    db = get_db()
    db.execute("INSERT INTO products (name, price) VALUES (?, ?)", (name, price))
    db.commit()
    return {"status": "created"}

Authentication

from fastapi import HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from fastapi import Security

security = HTTPBearer()

@app.get("/protected")
def protected(credentials: HTTPAuthorizationCredentials = Security(security)):
    if credentials.credentials != "my-secret":
        raise HTTPException(status_code=401)
    return {"ok": True}