How to create axios interceptors in a separate file in ReactJS

To create Axios interceptors in a separate file in a ReactJS application, you can define the interceptors in a utility file and then import and register them in your main application file (usually index.js or App.js). This approach keeps your code organized and separates the interceptor logic from the main application logic.

Here's a step-by-step guide:

1. Create an Axios Interceptors Utility File: Create a new file (e.g., axiosInterceptors.js) where you define your Axios interceptors. In this file, import Axios and define the interceptors:

   javascriptCopy code
   // axiosInterceptors.js
   import axios from 'axios';
   
   // Request interceptor
   axios.interceptors.request.use(
     (config) => {
       // Modify the request config (e.g., add headers, authentication token, etc.)
       return config;
     },
     (error) => {
       // Handle request error
       return Promise.reject(error);
     }
   );
   
   // Response interceptor
   axios.interceptors.response.use(
     (response) => {
       // Handle successful response
       return response;
     },
     (error) => {
       // Handle response error
       return Promise.reject(error);
     }
   );
   

2. Import Interceptors in Your Main Application File: In your main application file (e.g., index.js, App.js, or any other entry point), import the Axios instance and the interceptors from the utility file:

   javascriptCopy code
   // index.js or App.js (main application file)
   import React from 'react';
   import ReactDOM from 'react-dom';
   import axios from 'axios';
   import './axiosInterceptors'; // Import the interceptors
   
   import App from './App';
   
   ReactDOM.render(<App />, document.getElementById('root'));
   

   By importing the axiosInterceptors.js file, the interceptors will be executed, and Axios will use them for all requests and responses.

With this setup, you have successfully separated the Axios interceptor logic from the main application file. Now, any request or response made using Axios in your React application will go through the defined interceptors before reaching the server or being processed by your application. This allows you to handle common tasks, such as adding headers, handling errors, or performing actions based on the response, in a central place for your entire application.