global-configuration.en-US.md

Global Configuration

The context SWRConfig can provide global configurations (options) for all SWR hooks.

<SWRConfig value={options}>
  <Component/>
</SWRConfig>

In this example, all SWR hooks will use the same fetcher provided to load JSON data, and refresh every 3 seconds by default:

import useSWR, { SWRConfig } from 'swr'

function Dashboard () {
  const { data: events } = useSWR('/api/events')
  const { data: projects } = useSWR('/api/projects')
  const { data: user } = useSWR('/api/user', { refreshInterval: 0 }) // override

  // ...
}

function App () {
  return (
    <SWRConfig
      value={{
        refreshInterval: 3000,
        fetcher: (resource, init) => fetch(resource, init).then(res => res.json())
      }}
    >
      <Dashboard />
    </SWRConfig>
  )
}

Extra APIs

Cache Provider

Besides, all the options listed, SWRConfig also accepts an optional provider function. Please refer to the Cache section for more details.

<SWRConfig value={{ provider: () => new Map() }}>
  <Dashboard />
</SWRConfig>

Access To Global Configurations

You can use the useSWRConfig hook to get the global configurations, as well as mutate and cache:

import { useSWRConfig } from 'swr'

function Component () {
  const { refreshInterval, mutate, cache, ...restConfig } = useSWRConfig()

  // ...
}

Nested configurations will be extended. If no <SWRConfig> is used, it will return the default ones.