import useAxios from 'axios-hooks'

function App() {
  const [{ data, loading, error }, refetch] = useAxios(
    'https://api.myjson.com/bins/820fc'
  )

  if (loading) return <p>Loading...</p>
  if (error) return <p>Error!</p>

  return (
    <div>
      <button onClick={refetch}>refetch</button>
      <pre>{JSON.stringify(data, null, 2)}</pre>
    </div>
  )
}

Documentation

API

useAxios
configure
serializeCache
loadCache

Guides

Configuration
Manual Requests
Server Side Rendering

API

The package exports one default export and named exports:

import useAxios, { configure, loadCache, serializeCache } from 'axios-hooks'

useAxios(url|config, options)

The main React hook to execute HTTP requests.

url|config - The request URL or config object, the same argument accepted by axios.
options - An options object.
- manual ( false ) - If true, the request is not executed immediately. Useful for non-GET requests that should not be executed when the component renders. Use the execute function returned when invoking the hook to execute the request manually.
- useCache ( true ) - Allows caching to be enabled/disabled for the hook. It doesn't affect the execute function returned by the hook.

Returns:

[{ data, loading, error, response }, execute]

data - The success response data property (for convenient access).
loading - True if the request is in progress, otherwise False.
error - The error value
response - The whole success response object.
execute([config[, options]]) - A function to execute the request manually, bypassing the cache by default.
- config - Same config object as axios, which is shallow-merged with the config object provided when invoking the hook. Useful to provide arguments to non-GET requests.
- options - An options object.
  - useCache ( false ) - Allows caching to be enabled/disabled for this "execute" function.

configure({ cache, axios })

Allows to provide custom instances of cache and axios.

cache An instance of lru-cache
axios An instance of axios

serializeCache()

Dumps the request-response cache, to use in server side sendering scenarios.

Returns:

Promise<Array> A serializable representation of the request-response cache ready to be used by loadCache

loadCache(cache)

Populates the cache with serialized data generated by serializeCache.

cache The serializable representation of the request-response cache generated by serializeCache

Manual requests

On the client, requests are executed when the component renders using a React useEffect hook.

This may be undesirable, as in the case of non-GET requests. By using the manual option you can skip the automatic execution of requests and use the return value of the hook to execute them manually, optionally providing configuration overrides to axios.

Example

In the example below we use the useAxios hook twice. Once to load the data when the component renders, and once to submit data updates via a PUT request configured via the manual option.

import useAxios from 'axios-hooks'

function App() {
  const [{ data: getData, loading: getLoading, error: getError }] = useAxios(
    'https://api.myjson.com/bins/820fc'
  )

  const [
    { data: putData, loading: putLoading, error: putError },
    executePut
  ] = useAxios(
    {
      url: 'https://api.myjson.com/bins/820fc',
      method: 'PUT'
    },
    { manual: true }
  )

  function updateData() {
    executePut({
      data: {
        ...getData,
        updatedAt: new Date().toISOString()
      }
    })
  }

  if (getLoading || putLoading) return <p>Loading...</p>
  if (getError || putError) return <p>Error!</p>

  return (
    <div>
      <button onClick={updateData}>update data</button>
      <pre>{JSON.stringify(putData || getData, null, 2)}</pre>
    </div>
  )
}

Configuration

Unless provided via the configure function, axios-hooks uses as defaults:

axios - the default axios package export
cache - a new instance of the default lru-cache package export, with no arguments

These defaults may not suit your needs:

you may want a common base url for axios requests
the default (Infinite) cache size may not be a sensible default

In such cases you can use the configure function to provide your custom implementation of both.

When configure is used, it should be invoked once before any usages of the useAxios hook

Example

import { configure } from 'axios-hooks'
import LRU from 'lru-cache'
import Axios from 'axios'

const axios = Axios.create({
  baseURL: 'https://api.myjson.com/'
})

const cache = new LRU({ max: 10 })

configure({ axios, cache })

Server Side Rendering

axios-hooks seamlessly supports server side rendering scenarios, by preloading data on the server and providing the data to the client, so that the client doesn't need to reload it.

How it works

the React component tree is rendered on the server
useAxios HTTP requests are executed on the server
the server code awaits serializeCache() in order to obtain a serializable representation of the request-response cache
the server injects a JSON-serialized version of the cache in a window global variable
the client hydrates the cache from the global variable before rendering the application using loadCache

Example

<!-- fragment of the HTML template defining the window global variable -->

<script>
  window.__AXIOS_HOOKS_CACHE__ = {{{cache}}}
</script>

// server code for the server side rendering handler

import { serializeCache } from 'axios-hooks'

router.use(async (req, res) => {
  const index = fs.readFileSync(`${publicFolder}/index.html`, 'utf8')
  const html = ReactDOM.renderToString(<App />)

  // wait for axios-hooks HTTP requests to complete
  const cache = await serializeCache()

  res.send(
    index
      .replace('{{{html}}}', html)
      .replace('{{{cache}}}', JSON.stringify(cache).replace(/</g, '\\u003c'))
  )
})

// client side code for the application entry-point

import { loadCache } from 'axios-hooks'

loadCache(window.__AXIOS_HOOKS_CACHE__)

delete window.__AXIOS_HOOKS_CACHE__

ReactDOM.hydrate(<App />, document.getElementById('root'))

Promises

axios-hooks depends on a native ES6 Promise implementation to be supported. If your environment doesn't support ES6 Promises, you can polyfill.

Credits

axios-hooks is heavily inspired by graphql-hooks, developed by the awesome people at NearForm.

License

MIT