How to use the useSWR hook for data fetching with React-Query



Image not found!!

My apologies for the confusion earlier. useSWR is not a part of React-Query; it's actually a part of the SWR library (stale-while-revalidate). SWR is another library for data fetching, similar to React-Query but with a different focus and approach.

However, if you want to combine useSWR with React-Query, you can do so to take advantage of the features provided by both libraries. Here's how you can use useSWR for data fetching while still benefiting from React-Query's caching and background data fetching capabilities:

  1. Install SWR:
bash
npm install swr
  1. Import useSWR in your React component:
jsx
import useSWR from 'swr';
  1. Define a fetcher function to fetch your data:
jsx
const fetcher = (url) => fetch(url).then((res) => res.json());
  1. Use useSWR in your component:
jsx
const MyComponent = () => {
  const { data, error } = useSWR('/api/data', fetcher);

  if (error) return <div>Error fetching data</div>;
  if (!data) return <div>Loading...</div>;

  return (
    <div>
      <h1>Data:</h1>
      <pre>{JSON.stringify(data, null, 2)}</pre>
    </div>
  );
};

In this example:

  • We define a fetcher function that takes a URL and returns a promise which resolves to the JSON response from that URL.
  • We use useSWR hook, passing in the URL and the fetcher function. SWR will handle the data fetching and caching for us.
  • The data variable holds the fetched data, and error holds any error that occurs during fetching.
  • We render different UI based on the state of data and error.

While useSWR and React-Query are both data fetching libraries, they have different focuses and features. React-Query provides more advanced features like caching, background fetching, and query invalidation, whereas SWR focuses more on simplicity and reactivity. Depending on your specific requirements, you can choose the library that best fits your needs. If you decide to use React-Query, you wouldn't typically use useSWR alongside it, as React-Query already provides similar functionality and more.

Category List