FastAPI code explainers

python

from fastapi import Depends, FastAPI, HTTPException
from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker

Wiring SQLAlchemy sessions into FastAPI

dependency-injection orm sessions

Intermediate 7 steps

python

import stripe
from fastapi import APIRouter, Request, Header, HTTPException
 
from app.config import settings

Handling Stripe webhooks in FastAPI

webhooks signature-verification event-routing

Intermediate 7 steps

python

import time
from dataclasses import dataclass, field
 
from fastapi import Depends, FastAPI, HTTPException, Request, status

Token-bucket rate limiting in FastAPI

rate-limiting token-bucket dependency-injection

Advanced 10 steps

python

import csv
import io
from datetime import date

Streaming a CSV export in FastAPI

streaming async-generators csv

Advanced 8 steps

python

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel
from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession

How a paginated list endpoint works in FastAPI

pagination dependency-injection async-orm

Intermediate 8 steps

python

from fastapi import FastAPI, Request, status
from fastapi.responses import JSONResponse
 
app = FastAPI()

Custom exception handlers in FastAPI

exception handling error responses separation of concerns

Intermediate 7 steps