How to use the useSWR hook for data caching and revalidation with a custom error handling strategy in Next.js



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To use the useSWR hook for data caching and revalidation with custom error handling in Next.js, you'll first need to install the swr package if you haven't already:

bash
npm install swr

Then, you can use it in your Next.js application. Below is an example of how you can utilize useSWR with custom error handling:

jsx
// Import the necessary dependencies
import useSWR from 'swr';

// Define a custom fetcher function to handle data fetching
const fetcher = async (url) => {
  const res = await fetch(url);
  if (!res.ok) {
    throw new Error('Failed to fetch data');
  }
  return res.json();
};

// Component using useSWR with custom error handling
const MyComponent = () => {
  // Define the API endpoint you want to fetch data from
  const apiUrl = '/api/data'; // Replace with your actual API endpoint

  // Fetch data with useSWR hook
  const { data, error } = useSWR(apiUrl, fetcher);

  // Custom error handling
  if (error) {
    return <div>Error: {error.message}</div>;
  }

  // Render loading state while data is being fetched
  if (!data) {
    return <div>Loading...</div>;
  }

  // Render data once fetched successfully
  return (
    <div>
      {data.map(item => (
        <div key={item.id}>{item.name}</div>
      ))}
    </div>
  );
};

export default MyComponent;

In this example:

  1. We define a custom fetcher function that handles data fetching. Inside this function, we use fetch to make a request to the specified URL. If the response is not successful (!res.ok), we throw an error.
  2. We use the useSWR hook in our component, passing the API endpoint URL and the fetcher function as arguments. This hook handles data caching and revalidation for us.
  3. Inside the component, we check for error returned by useSWR. If there's an error, we render an error message.
  4. If there's no error but the data is still loading (!data), we render a loading indicator.
  5. Once the data is fetched successfully, we render it.

You can replace /api/data with your actual API endpoint URL. Additionally, customize the error handling and loading states according to your application's needs.

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