Fastapi Tutorial Pdf | 2024 |

FastAPI Tutorial: Building High-Performance APIs with Python

7.2 JWT Token Authentication

FastAPI’s OAuth2PasswordBearer integrates with JWT libraries (e.g., python-jose). A typical flow:

Client posts username/password to /token.
Server validates and returns a JWT.
Client includes JWT in Authorization: Bearer <token> header.
FastAPI extracts and verifies the user.

Most comprehensive FastAPI tutorial PDFs include a full JWT example.

Chapter 5: Dependency Injection – The Secret Sauce

Dependencies allow you to share logic (database sessions, authentication, permissions) across endpoints without repeating code. fastapi tutorial pdf

Chapter 2: Setup & First API

3.2 Query Parameters

@app.get("/search/")
def search(q: str, limit: int = 10, sort: str = "asc"):
    return "query": q, "limit": limit, "sort": sort

URL example: /search/?q=fastapi&limit=5&sort=desc

7.1 Simple API Key Header

from fastapi import Security, HTTPAuthorizationCredentials
API_KEY = "my-secret-key"
def verify_api_key(api_key: str = Header(...)):
if api_key != API_KEY:
raise HTTPException(status_code=403)
return api_key
@app.get("/secure")
async def secure_endpoint(api_key: str = Depends(verify_api_key)):
return "message": "Access granted"
 Client posts  username/password  to  /token

Chapter 6: Error Handling and Responses

FastAPI makes HTTP exception handling clean and consistent. Most comprehensive FastAPI tutorial PDFs include a full