To change the state of a React Context inside an Axios instance, you need to access the context's state setter function from within the Axios instance's response interceptor. This will allow you to update the context state based on the data returned by the Axios request.

Here's a step-by-step guide on how to achieve this:

  1. Create your React Context: First, define your React Context using the createContext function. This context will hold the state you want to update based on the Axios response.
javascript
// MyContext.js import { createContext, useState } from 'react'; const MyContext = createContext(); const MyProvider = ({ children }) => { const [data, setData] = useState(null); return ( <MyContext.Provider value={{ data, setData }}> {children} </MyContext.Provider> ); }; export { MyContext, MyProvider };
  1. Set up the Axios instance with a response interceptor: Create an Axios instance and add a response interceptor that will update the state of your React Context after the request is completed.
javascript
// api.js import Axios from 'axios'; import { useContext } from 'react'; import { MyContext } from './MyContext'; const api = Axios.create({ baseURL: 'https://api.example.com', // Your API URL }); // Add a response interceptor api.interceptors.response.use( (response) => { // If the response is successful, update the context state const { setData } = useContext(MyContext); setData(response.data); // Update the state with the Axios response data return response; }, (error) => { return Promise.reject(error); } ); export default api;
  1. Wrap your application with the Context Provider: In your main application file, wrap your entire application with the MyProvider to make the context available to all components.
javascript
// index.js (or App.js) import React from 'react'; import ReactDOM from 'react-dom'; import { MyProvider } from './MyContext'; import App from './App'; ReactDOM.render( <MyProvider> <App /> </MyProvider>, document.getElementById('root') );

Now, when you make API requests using the api instance, the response interceptor will update the state of your React Context using the setData function from the context provider. You can then use the updated context state in your components to access the data.

Remember that the Axios response interceptor will be triggered for every successful API response. Make sure to handle any error scenarios appropriately, depending on your use case.

Also, note that the above example assumes you are using React with functional components and hooks. If you are using class components, you can use the Consumer pattern to access the context inside your Axios interceptor.

Have questions or queries?
Get in Touch