SWR vs React Query: Which is Better for Data Fetching?

What are the main differences between SWR and React Query?

SWR and React Query are both libraries for data fetching in React, but they have different philosophies. SWR focuses on simplicity and revalidation, while React Query offers more features like caching and pagination.

Which one should I use for a new project?

It depends on your project's needs. If you want a lightweight solution with minimal setup, SWR might be better. If you need advanced features like caching and background updates, React Query is a great choice.

Can you give me an example of how to use SWR?

Sure! Here's a simple example:

import useSWR from 'swr';

const fetcher = url => fetch(url).then(res => res.json());

function App() {
  const { data, error } = useSWR('/api/data', fetcher);

  if (error) return <div>Error loading data</div>;
  if (!data) return <div>Loading...</div>;
  return <div>{data.message}</div>;
}

What about React Query? How does it work?

React Query uses a hook called useQuery. Here's a basic example:

import { useQuery } from 'react-query';

function App() {
  const { data, error, isLoading } = useQuery('data', () => fetch('/api/data').then(res => res.json()));

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error loading data</div>;
  return <div>{data.message}</div>;
}