How to Handle Exceptions and Build Custom Exceptions in FastAPI

In this essential FastAPI tutorial, we dive into exception handling — a critical part of building robust and production-ready web APIs. FastAPI provides powerful tools for managing errors gracefully, allowing you to deliver meaningful error messages and HTTP responses to your users.

You’ll learn how to catch and raise exceptions using built-in tools like HTTPException, and how to create your own custom exception classes with personalized responses and status codes.

What You’ll Learn:
What is exception handling and why it matters in API development
How to raise built-in HTTPException with custom status codes and messages
How to build and use custom exception classes
Using @app.exception_handler() to define global custom exception handlers
Returning structured JSON error responses
How to handle RequestValidationError and ValueError in a user-friendly way
Tips for logging errors and debugging
Real-world examples like catching unauthorized access, missing records, and invalid input

Why Exception Handling Is Important:
Proper error handling is key to a great user experience and secure API development. Instead of generic 500 Internal Server Errors, you can provide descriptive and controlled responses. Whether you're dealing with user authentication, data validation, or custom business logic errors — you’ll need to gracefully handle what goes wrong.

You’ll also see how to prevent sensitive information from being leaked to the client and how to keep error responses consistent across your API.

Who Is This For?

FastAPI beginners looking to level up

Intermediate Python web developers

Backend engineers building real-world APIs

Anyone interested in building reliable, scalable APIs

Developers transitioning from Flask or Django to FastAPI

Tools & Tech:

FastAPI

Python 3.10+

Uvicorn (for running the app)

HTTPException, Request, status module

Custom Exception Classes

Make your FastAPI app smarter, safer, and easier to debug with proper exception handling!

Don’t forget to Like, Comment, and Subscribe for more practical FastAPI development content.

#FastAPI #ExceptionHandling #PythonFastAPI #CustomExceptions #APIErrorHandling #BackendDevelopment #FastAPIErrorResponse #FastAPITutorial #PythonBackend #WebAPI #FastAPIAdvanced










-------------------Online Courses to learn----------------------------
Blockchain Course - http://bit.ly/2Mmzcv0
Big Data Hadoop Course - http://bit.ly/2MV97PL
Java - https://bit.ly/2H6wqXk
C++ - https://bit.ly/2q8VWl1
AngularJS - https://bit.ly/2qebsLu
Python - https://bit.ly/2Eq0VSt
C- https://bit.ly/2HfZ6L8
Android - https://bit.ly/2qaRSAS
Linux - https://bit.ly/2IwOuqz
AWS Certified Solutions Architect - https://bit.ly/2JrGoAF
Modern React with Redux - https://bit.ly/2H6wDtA
MySQL - https://bit.ly/2qcF63Z
----------------------Follow---------------------------------------------
My Website - http://www.codebind.com
My Blog - https://goo.gl/Nd2pFn
My Facebook Page - https://goo.gl/eLp2cQ
Google+ - https://goo.gl/lvC5FX
Twitter - https://twitter.com/ProgrammingKnow
Pinterest - https://goo.gl/kCInUp
Text Case Converter - https://goo.gl/pVpcwL
-------------------------Stuff I use to make videos -------------------
Stuff I use to make videos
Windows notebook – http://amzn.to/2zcXPyF
Apple MacBook Pro – http://amzn.to/2BTJBZ7
Ubuntu notebook - https://amzn.to/2GE4giY
Desktop - http://amzn.to/2zct252
Microphone – http://amzn.to/2zcYbW1
notebook mouse – http://amzn.to/2BVs4Q3
------------------Facebook Links ----------------------------------------
http://fb.me/ProgrammingKnowledgeLearning/
http://fb.me/AndroidTutorialsForBeginners
http://fb.me/Programmingknowledge
http://fb.me/CppProgrammingLanguage
http://fb.me/JavaTutorialsAndCode
http://fb.me/SQLiteTutorial
http://fb.me/UbuntuLinuxTutorials
http://fb.me/EasyOnlineConverter