SWR — React Hooks library for data fetching

From the Next.js folks comes SWR, a React Hooks library for data fetching built on Suspense:

The name “SWR” is derived from stale-while-revalidate, a cache invalidation strategy popularized by HTTP RFC 5861. SWR first returns the data from cache (stale), then sends the fetch request (revalidate), and finally comes with the up-to-date data again.

It can avoid scenarios where you need to pass down a fetched user into several child components

import useSWR from 'swr'

const fetcher = (...args) => fetch(...args).then(res => res.json())

function useUser (id) {
  const { data, error } = useSWR(`/api/user/${id}`, fetcher)

  return {
    user: data,
    isLoading: !error && !data,
    isError: error
// page component
function Page () {
  return <div>
    <Navbar />
    <Content />

// child components
function Navbar () {
  return <div>
    <Avatar />

function Content () {
  const { user, isLoading } = useUser()
  if (isLoading) return <Spinner />
  return <h1>Welcome back, {user.name}</h1>

function Avatar () {
  const { user, isLoading } = useUser()
  if (isLoading) return <Spinner />
  return <img src={user.avatar} alt={user.name} />

With SWR being used, this will result in only 1 request to /api/user/${id}.

The most beautiful thing is that there will be only 1 request sent to the API, because they use the same SWR key and the request is deduped, cached and shared automatically.

SWR — React Hooks library for data fetching →

redaxios – The Axios API, as an 800 byte Fetch wrapper.

Axios has a great API that developers love. Redaxios provides that API in 800 bytes, using native fetch().

For those searching for ways to shave a few kilobytes off of their bundles, that’s less than 1/5th of the size. This is made possible by using the browser’s native Fetch API, which is supported in all modern browsers and polyfilled by most tools including Next.js, Create React App and Preact CLI.

To swith from axios to redaxios, you only need to adjust your import statement

import axios from 'redaxios';
// That's it! Use as you would normally