useSWR is a data fetching library in React that does not include cookies in its default configuration. By default, useSWR uses the fetch API, which does not automatically include cookies in the request headers.

To include cookies in your useSWR requests, you can modify the fetcher function used by useSWR to include the necessary cookies in the request headers.

Here's an example of how you can modify the fetcher function to include cookies using the js-cookie library:

  1. Install Dependencies: First, install the required dependencies for useSWR and js-cookie:

    bash
    npm install swr js-cookie
  2. Create a Custom Fetcher Function: Next, create a custom fetcher function that includes cookies in the request headers. You can use the js-cookie library to retrieve the cookies and add them to the request headers.

    javascript
    import useSWR from 'swr'; import Cookies from 'js-cookie'; const fetcherWithCookies = async (url) => { const token = Cookies.get('your_cookie_name'); // Replace 'your_cookie_name' with your actual cookie name const headers = { // Set the 'Authorization' header if your API requires authentication // Authorization: `Bearer ${token}`, Cookie: `your_cookie_name=${token}`, // Replace 'your_cookie_name' with your actual cookie name }; const response = await fetch(url, { headers }); const data = await response.json(); if (!response.ok) { throw new Error(data.message || 'Fetch failed'); } return data; };
  3. Use the Custom Fetcher with useSWR: Now, you can use the useSWR hook with the custom fetcher function that includes cookies in the request headers.

    javascript
    const MyComponent = () => { const { data, error } = useSWR('/api/data', fetcherWithCookies); if (error) { return <div>Error fetching data</div>; } if (!data) { return <div>Loading...</div>; } // Render your component using the 'data' obtained from the server return <div>{JSON.stringify(data)}</div>; };

    In this example, the fetcherWithCookies function includes the cookies in the request headers, and the useSWR hook uses this custom fetcher to fetch data.

Remember to replace 'your_cookie_name' with the actual name of the cookie you want to include in the request headers. Additionally, if your API requires authentication, you can include the access token in the Authorization header as shown in the commented code within the fetcherWithCookies function.

By using the custom fetcher with useSWR, you can ensure that cookies are included in your requests when using this data fetching library.

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