axios

What is axios?

Axios is a promise-based HTTP client for the browser and Node.js. It provides an easy-to-use API for sending asynchronous HTTP requests to REST endpoints and performing CRUD operations. It can be used to make XMLHttpRequests from the browser or HTTP requests from Node.js, supports the Promise API, and provides a way to intercept request and response, transform request and response data, and cancel requests.

What are axios's main functionalities?

Performing GET requests

This feature allows you to perform a GET request to retrieve data from a specified resource.

axios.get('/user?ID=12345').then(function (response) { console.log(response); }).catch(function (error) { console.log(error); });

Performing POST requests

This feature allows you to perform a POST request to send data to a server to create/update a resource.

axios.post('/user', { firstName: 'Fred', lastName: 'Flintstone' }).then(function (response) { console.log(response); }).catch(function (error) { console.log(error); });

Performing concurrent requests

This feature allows you to make multiple requests simultaneously.

axios.all([axios.get('/user/12345'), axios.get('/user/67890')]).then(axios.spread(function (acct, perms) { console.log(acct, perms); }));

Interceptors

This feature allows you to intercept requests or responses before they are handled by then or catch.

axios.interceptors.request.use(function (config) { config.headers.Authorization = AUTH_TOKEN; return config; }, function (error) { return Promise.reject(error); });

Creating instances

This feature allows you to create a new instance of axios with custom config defaults.

const instance = axios.create({ baseURL: 'https://api.example.com' }); instance.get('/users').then(function (response) { console.log(response); });

Other packages similar to axios

fetch

The Fetch API provides a JavaScript interface for accessing and manipulating parts of the HTTP pipeline, such as requests and responses. It is a modern alternative to XMLHttpRequest and is native to modern browsers. Unlike axios, it is not based on promises by default but can be used with promises.

superagent

Superagent is a light-weight progressive ajax API crafted for flexibility, readability, and a low learning curve after being frustrated with many of the existing request APIs. It is similar to axios but with a different API design and chainable methods.

got

Got is a human-friendly and powerful HTTP request library for Node.js. It is designed to be a simpler and more performant alternative to Node's native http module. Got offers stream support, promise APIs, and advanced features like retries and timeouts.

request

Request is a simplified HTTP request client 'simplified' with many features. It is one of the most popular HTTP client libraries but has been deprecated as of February 2020. It had a callback-based API, which is different from axios's promise-based API.

node-fetch

node-fetch is a light-weight module that brings the Fetch API to Node.js. It is an implementation of the window.fetch function for Node.js, aiming to provide a consistent API with the browser's fetch function. It is similar to axios in terms of promise-based requests but follows the Fetch API standard.

README

axios

Promise based HTTP client for the browser and node.js

Features

• Make XMLHttpRequests from the browser
• Make http requests from node.js
• Supports the Promise API
• Intercept request and response
• Transform request and response data
• Automatic transforms for JSON data
• Client side support for protecting against XSRF

Browser Support

Latest ✔	Latest ✔	Latest ✔	Latest ✔	Latest ✔	8+ ✔

Installing

Using cdn:

<script src="https://npmcdn.com/axios/dist/axios.min.js"></script>

Using npm:

$ npm install axios

Using bower:

$ bower install axios

Example

Performing a GET request

// Make a request for a user with a given ID
axios.get('/user?ID=12345')
  .then(function (response) {
    console.log(response);
  })
  .catch(function (response) {
    console.log(response);
  });

// Optionally the request above could also be done as
axios.get('/user', {
    params: {
      ID: 12345
    }
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (response) {
    console.log(response);
  });

Performing a POST request

axios.post('/user', {
    firstName: 'Fred',
    lastName: 'Flintstone'
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (response) {
    console.log(response);
  });

Performing multiple concurrent requests

function getUserAccount() {
  return axios.get('/user/12345');
}

function getUserPermissions() {
  return axios.get('/user/12345/permissions');
}

axios.all([getUserAccount(), getUserPermissions()])
  .then(axios.spread(function (acct, perms) {
    // Both requests are now complete
  }));

axios API

Requests can be made by passing the relevant config to axios.

axios(config)

// Send a POST request
axios({
  method: 'post',
  url: '/user/12345',
  data: {
    firstName: 'Fred',
    lastName: 'Flintstone'
  }
});

axios(url[, config])

// Send a GET request (default method)
axios('/user/12345');

Request method aliases

For convenience aliases have been provided for all supported request methods.

axios.get(url[, config])

axios.delete(url[, config])

axios.head(url[, config])

axios.post(url[, data[, config]])

axios.put(url[, data[, config]])

axios.patch(url[, data[, config]])

NOTE

When using the alias methods url, method, and data properties don't need to be specified in config.

Concurrency

Helper functions for dealing with concurrent requests.

axios.all(iterable)

axios.spread(callback)

Creating an instance

You can create a new instance of axios with a custom config.

axios.create([config])

var instance = axios.create({
  baseURL: 'https://some-domain.com/api/',
  timeout: 1000,
  headers: {'X-Custom-Header': 'foobar'}
});

Instance methods

The available instance methods are listed below. The specified config will be merged with the instance config.

axios#request(config)

axios#get(url[, config])

axios#delete(url[, config])

axios#head(url[, config])

axios#post(url[, data[, config]])

axios#put(url[, data[, config]])

axios#patch(url[, data[, config]])

Request Config

These are the available config options for making requests. Only the url is required. Requests will default to GET if method is not specified.

{
  // `url` is the server URL that will be used for the request
  url: '/user',

  // `method` is the request method to be used when making the request
  method: 'get', // default

  // `baseURL` will be prepended to `url` unless `url` is absolute.
  // It can be convenient to set `baseURL` for an instance of axios to pass relative URLs
  // to methods of that instance.
  baseURL: 'https://some-domain.com/api/',

  // `transformRequest` allows changes to the request data before it is sent to the server
  // This is only applicable for request methods 'PUT', 'POST', and 'PATCH'
  // The last function in the array must return a string, an ArrayBuffer, or a Stream
  transformRequest: [function (data) {
    // Do whatever you want to transform the data

    return data;
  }],

  // `transformResponse` allows changes to the response data to be made before
  // it is passed to then/catch
  transformResponse: [function (data) {
    // Do whatever you want to transform the data

    return data;
  }],

  // `headers` are custom headers to be sent
  headers: {'X-Requested-With': 'XMLHttpRequest'},

  // `params` are the URL parameters to be sent with the request
  params: {
    ID: 12345
  },

  // `paramsSerializer` is an optional function in charge of serializing `params`
  // (e.g. https://www.npmjs.com/package/qs, http://api.jquery.com/jquery.param/)
  paramsSerializer: function(params) {
    return Qs.stringify(params, {arrayFormat: 'brackets'})
  },

  // `data` is the data to be sent as the request body
  // Only applicable for request methods 'PUT', 'POST', and 'PATCH'
  // When no `transformRequest` is set, must be a string, an ArrayBuffer, a hash, or a Stream
  data: {
    firstName: 'Fred'
  },

  // `timeout` specifies the number of milliseconds before the request times out.
  // If the request takes longer than `timeout`, the request will be aborted.
  timeout: 1000,

  // `withCredentials` indicates whether or not cross-site Access-Control requests
  // should be made using credentials
  withCredentials: false, // default

  // `adapter` allows custom handling of requests which makes testing easier.
  // Call `resolve` or `reject` and supply a valid response (see [response docs](#response-api)).
  adapter: function (resolve, reject, config) {
    /* ... */
  },

  // `auth` indicates that HTTP Basic auth should be used, and supplies credentials.
  // This will set an `Authorization` header, overwriting any existing
  // `Authorization` custom headers you have set using `headers`.
  auth: {
    username: 'janedoe',
    password: 's00pers3cret'
  }

  // `responseType` indicates the type of data that the server will respond with
  // options are 'arraybuffer', 'blob', 'document', 'json', 'text', 'stream'
  responseType: 'json', // default

  // `xsrfCookieName` is the name of the cookie to use as a value for xsrf token
  xsrfCookieName: 'XSRF-TOKEN', // default

  // `xsrfHeaderName` is the name of the http header that carries the xsrf token value
  xsrfHeaderName: 'X-XSRF-TOKEN', // default

  // `progress` allows handling of progress events for 'POST' and 'PUT uploads'
  // as well as 'GET' downloads
  progress: function (progressEvent) {
    // Do whatever you want with the native progress event
  },

  // `maxContentLength` defines the max size of the http response content allowed
  maxContentLength: 2000,

  // `validateStatus` defines whether to resolve or reject the promise for a given
  // HTTP response status code. If `validateStatus` returns `true` (or is set to `null`
  // or `undefined`), the promise will be resolved; otherwise, the promise will be
  // rejected.
  validateStatus: function (status) {
    return status >= 200 && status < 300; // default
  }
}

Response Schema

The response for a request contains the following information.

{
  // `data` is the response that was provided by the server
  data: {},

  // `status` is the HTTP status code from the server response
  status: 200,

  // `statusText` is the HTTP status message from the server response
  statusText: 'OK',

  // `headers` the headers that the server responded with
  headers: {},

  // `config` is the config that was provided to `axios` for the request
  config: {}
}

When using then or catch, you will receive the response as follows:

axios.get('/user/12345')
  .then(function(response) {
    console.log(response.data);
    console.log(response.status);
    console.log(response.statusText);
    console.log(response.headers);
    console.log(response.config);
});

Config Defaults

You can specify config defaults that will be applied to every request.

Global axios defaults

axios.defaults.baseURL = 'https://api.example.com';
axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

Custom instance defaults

// Set config defaults when creating the instance
var instance = axios.create({
  baseURL: 'https://api.example.com'
});

// Alter defaults after instance has been created
instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;

Config order of precedence

Config will be merged with an order of precedence. The order is library defaults found in lib/defaults.js, then defaults property of the instance, and finally config argument for the request. The latter will take precedence over the former. Here's an example.

// Create an instance using the config defaults provided by the library
// At this point the timeout config value is `0` as is the default for the library
var instance = axios.create();

// Override timeout default for the library
// Now all requests will wait 2.5 seconds before timing out
instance.defaults.timeout = 2500;

// Override timeout for this request as it's known to take a long time
instance.get('/longRequest', {
  timeout: 5000
});

Interceptors

You can intercept requests or responses before they are handled by then or catch.

// Add a request interceptor
axios.interceptors.request.use(function (config) {
    // Do something before request is sent
    return config;
  }, function (error) {
    // Do something with request error
    return Promise.reject(error);
  });

// Add a response interceptor
axios.interceptors.response.use(function (response) {
    // Do something with response data
    return response;
  }, function (error) {
    // Do something with response error
    return Promise.reject(error);
  });

If you may need to remove an interceptor later you can.

var myInterceptor = axios.interceptors.request.use(function () {/*...*/});
axios.interceptors.request.eject(myInterceptor);

You can add interceptors to a custom instance of axios.

var instance = axios.create();
instance.interceptors.request.use(function () {/*...*/});

Handling Errors

axios.get('/user/12345')
  .catch(function (response) {
    if (response instanceof Error) {
      // Something happened in setting up the request that triggered an Error
      console.log('Error', response.message);
    } else {
      // The request was made, but the server responded with a status code
      // that falls out of the range of 2xx
      console.log(response.data);
      console.log(response.status);
      console.log(response.headers);
      console.log(response.config);
    }
  });

You can define a custom HTTP status code error range using the validateStatus config option.

axios.get('/user/12345', {
  validateStatus: function (status) {
    return status < 500; // Reject only if the status code is greater than or equal to 500
  }
})

Semver

Until axios reaches a 1.0 release, breaking changes will be released with a new minor version. For example 0.5.1, and 0.5.4 will have the same API, but 0.6.0 will have breaking changes.

Promises

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

TypeScript

axios includes a TypeScript definition.

/// <reference path="axios.d.ts" />
import * as axios from 'axios';
axios.get('/user?ID=12345');

Resources

• Changelog
• Ecosystem
• Contributing Guide
• Code of Conduct

Credits

axios is heavily inspired by the $http service provided in Angular. Ultimately axios is an effort to provide a standalone $http-like service for use outside of Angular.

License

MIT