axios-hooks

axios-hooks

React hooks for axios, with built-in support for server side rendering.

Features

• All the axios awesomeness you are familiar with
• Zero configuration, but configurable if needed
• One-line usage
• Super straightforward to use with SSR

Installation

npm install axios axios-hooks

axios is a peer dependency and needs to be installed explicitly

Quick Start

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
• Server Side Rendering

API

The package exports one default export and named exports:

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

useAxios(url|config)

The main React hook to execute HTTP requests. It accepts the same arguments as axios.

• url|config The request URL or config object

Returns:

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

• 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

• refetch Function to reload the data

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

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

1. the React component tree is rendered on the server
2. useAxios HTTP requests are executed on the server
3. the server code awaits serializeCache() in order to obtain a serializable representation of the request-response cache
4. the server injects a JSON-serialized version of the cache in a window global variable
5. 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