Global Error Handling and Interceptors with Axios
Explore how to implement Axios interceptors to manage global error handling and request modifications in React applications. This lesson helps you keep API calls clean and consistent by centralizing authentication tokens, error transformation, and logging, improving app resilience.
When apps start communicating with multiple APIs or secure endpoints, similar logic often repeats everywhere — adding tokens, logging requests, catching errors, or normalizing messages. Handling this inside each React component quickly turns messy and inconsistent.
Interceptors
Axios provides a clean solution: interceptors — middleware-like functions that run before requests and after responses. They let us modify requests (e.g., attach headers or tokens) and globally handle errors without duplicating code across components. Combined with our Axios instance, interceptors help create a unified layer of control that makes our app more predictable and resilient.
Main concept: How interceptors work
Interceptors act like checkpoints in the request–response cycle.
apiClient.interceptors.request.use((config) => {console.log("Request sent to:", config.url);return config;});apiClient.interceptors.response.use((response) => response,(error) => {console.error("Error occurred:", error.message);return Promise.reject(error);});
We can ...