Handle API Errors in React (401, 403, Token Expiration) | JWT Auth Tutorial

Published: 12 April 2026
on channel: MarcMan Media

▶️ Part of the React + FastAPI Full Stack Tutorial series
📘 Watch the full playlist here: • React + FastAPI Full Stack Tutorial — JWT ...
💻 GitHub repository for this series: github.com/marcmanmedia/northwind-lite-react

Learn how to handle API errors in React like a production-ready developer.

In this episode, we improve our React + FastAPI with JWT authentication application by properly handling 401 Unauthorized, 403 Forbidden, and token expiration scenarios. Instead of letting your app crash or confuse users, you'll implement clean error handling, automatic logout, and better user feedback.

What you’ll learn:
• How to detect and handle 401 Unauthorized errors
• How to manage 403 Forbidden responses
• How to safely handle expired JWT tokens
• How to log users out automatically when sessions expire
• How to improve UX with clear error messaging
• How to structure API error handling in a scalable way

We’ll update:
• Your API layer (fetch with Authorization headers)
• Your React state management for error handling
• Optional route protection with redirects

This is a critical step in turning your app into a secure, production-ready system.

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