Authentication Done Right: JWT, OAuth2, and Session Management

Authentication is the most security-critical part of your app. Here's how to implement it properly without reinventing the wheel. JWT Authentication with FastAPI from datetime import datetime , timedelta from jose import JWTError , jwt from passlib.context import CryptContext from fastapi import Depends , HTTPException , status from fastapi.security import OAuth2PasswordBearer SECRET_KEY = " your-secret-key-from-env " ALGORITHM = " HS256 " ACCESS_TOKEN_EXPIRE_MINUTES = 30 pwd_context = CryptContext ( schemes = [ " bcrypt " ], deprecated = " auto " ) oauth2_scheme = OAuth2PasswordBearer ( tokenUrl = " token " ) def hash_password ( password : str ) -> str : return pwd_context . hash ( password ) def verify_password ( plain : str , hashed : str ) -> bool : return pwd_context . verify ( plain , hashed ) def create_access_token ( data : dict , expires_delta : timedelta = None ) -> str : to_encode = data . copy () expire = datetime . utcnow () + ( expires_delta or timedelta ( minutes = 15 ))