xior

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Intro

A lite request lib based on fetch with plugins support.

Features:

• 🔥 Use fetch
• 🫡 Similar axios API: axios.create / axios.interceptors / .get/post/put/patch/delete/head/options
• 🤙 Support timeout and cancel requests
• 🥷 Plugin support: error retry, cache, throttling, dedupe, error cache, mock and easily create custom plugins
• 🚀 Lightweight (~8KB, Gzip ~3kb)
• 👊 Unit tested and strongly typed 💪

Table of Contents

• Intro
• Table of Contents
• Why Choose xior?
  • Why not just use axios?
  • Why choose xior over Custom Fetch Wrappers?
• Getting Started
  • Installing
    • Package manager
    • Use CDN
  • Create instance
  • GET / POST / DELETE / PUT / PATCH / OPTIONS / HEAD
  • Change default headers or params
  • Get response headers
  • Upload file
  • Using interceptors
  • Timeout and Cancel request
  • Encrypt and Decrypt Example
• Plugins
  • Error retry plugin
  • Request throttle plugin
  • Request dedupe plugin
  • Error cache plugin
  • Cache plugin
  • Upload and download progress plugin
  • Mock plugin
  • Create your own custom plugin
• Helper functions
• FAQ
  • 1. Is xior 100% compatiable with axios?
  • 2. Can I use xior in projects like Bun, Expo, React Native, Next.js, Vue, or Nuxt.js?
  • 3. How do I handle responses with types like 'stream', 'document', 'arraybuffer', or 'blob'?
  • 5. How do I support older browsers?
  • 6. Why is xior named "xior"?
  • 7. Where can I ask additional questions?
• Migrate from axios to xior
  • GET
  • POST
  • axios(requestObj): axios({ method: 'get', params: { a: 1 } })
  • Creating an instance
  • Get response headers
  • Download file with responseType: 'stream' (In Node.JS)
  • Use stream
• Migrate from fetch to xior
  • GET
  • POST
  • Abort a fetch
  • Sending a request with credentials included
  • Uploading a file
  • Processing a text file line by line
• Thanks

Why Choose xior?

xior use the native fetch API, offering several advantages:

• Web Standard: Fetch is a widely supported web standard, ensuring compatibility across different environments.
• Built-in Availability: Both Node.js and browsers have built-in fetch implementations, eliminating the need for external dependencies.
• Edge Compatibility: Unlike Axios, xior works seamlessly in edge runtimes, making it suitable for serverless functions and Next.js middleware.
• Convenient API and Plugin Support: xior provides a familiar API similar to Axios, while also offering plugin support for customization and extending functionalities.

Why not just use axios?

If you want proxy support, use axios, because xior doesn't support proxy feature yet

While popular and convenient, Axios currently lacks native edge runtime support (see: https://github.com/axios/axios/issues/5523). This can be an issue for specific use cases like Next.js serverless functions and middleware files, where fetch offers built-in caching and revalidation mechanisms (see: https://nextjs.org/docs/app/api-reference/functions/fetch).

Why choose xior over Custom Fetch Wrappers?

While you can certainly create your own wrapper library around fetch, xior offers a pre-built solution with a familiar API, plugin support for extensibility, and potentially a more streamlined development experience.

Getting Started

Installing

Package manager

# npm
npm install xior

# pnpm
pnpm add xior

# bun
bun add xior

# yarn
yarn add xior

Use CDN

Since v0.2.1, xior support UMD format

Use jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.get('https://exmapledomain.com/api').then((res) => {
    console.log(res.data);
  });
</script>

Use unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Usage -->
<script>
  xior.get('https://exmapledomain.com/api').then((res) => {
    console.log(res.data);
  });
</script>

Create instance

import xior from 'xior';

export const xiorInstance = xior.create({
  baseURL: 'https://apiexampledomian.com/api',
  headers: {
    // put your common custom headers here
  },
});

GET / POST / DELETE / PUT / PATCH / OPTIONS / HEAD

GET

HEAD / DELETE / OPTIONS are same usage with GET method

async function run() {
  const { data } = await xiorInstance.get('/');

  // with params
  const { data: data2 } = await xiorInstance.get('/', { params: { a: 1, b: 2 } });

  // with headers
  const { data: data3 } = await xiorInstance.get('/', {
    params: { a: 1, b: 2 },
    headers: {
      'content-type': 'application/x-www-form-urlencoded',
    },
  });

  // types
  const { data: data4 } = await xiorInstance.get<{ field1: string; field2: number }>('/');
}

POST

PUT/PATCH methods are same usage with POST

async function run() {
  const { data: data3 } = await xiorInstance.post<{ field1: string; field2: number }>(
    '/',
    { a: 1, b: '2' },
    {
      params: { id: 1 },
      headers: {
        'content-type': 'application/json',
      },
    }
  );
}

Change default headers or params

import xior from 'xior';

export const xiorInstance = xior.create({
  baseURL: 'https://apiexampledomian.com/api',
});

function setAccessToken(token: string) {
  // xiorInstance.defaults.params['x'] = 1;
  xiorInstance.defaults.headers['Authorization'] = `Bearer ${token}`;
}

function removeUserToken() {
  // delete xiorInstance.defaults.params['x'];
  delete xiorInstance.defaults.headers['Authorization'];
}

Get response headers

import xior from 'xior';

const xiorInstance = xior.create({
  baseURL: 'https://apiexampledomian.com/api',
});

const { data, headers } = await xiorInstance.get('/');

console.log(headers.get('X-Header-Name'));

Upload file

xior supports file uploads using the FormData API and provides an optional 'xior/plugins/progress' plugin for simulating upload progress, usage similar to Axios.

import Xior from 'xior';
import uploadDownloadProgressPlugin from 'xior/plugins/progress';

const http = Xior.create({});

http.plugins.use(
  uploadDownloadProgressPlugin({
    progressDuration: 5 * 1000,
  })
);

const formData = FormData();
formData.append('file', fileObject);
formData.append('field1', 'val1');
formData.append('field2', 'val2');

http.post('/upload', formData, {
  onUploadProgress(e) {
    console.log(`Upload progress: ${e.progress}%`);
  },
  // progressDuration: 10 * 1000
});

Using interceptors

xior supports interceptors similar to Axios, allowing you to modify requests and handle responses programmatically.

Request inteceptors:

import xior, { merge } from 'xior';

const http = xior.create({
  // ...options
});

http.inteceptors.request.use((config) => {
  const token = localStorage.getItem('REQUEST_TOKEN');
  if (!token) return config;

  return merge(config, {
    headers: {
      Authorization: `Bearer ${token}`,
    },
  });
});

// One more inteceptor for request
http.inteceptors.request.use((config) => {
  return config;
});

Response inteceptors:

import xior, { merge } from 'xior';

const http = xior.create({});

http.inteceptors.response.use(
  (result) => {
    const { data, request: config, response: originalResponse } = result;
    return result;
  },
  async (error) => {
    if (error?.response?.status === 401) {
      localStorage.removeItem('REQUEST_TOKEN');
    }
  }
);

Timeout and Cancel request

Timeout:

import xior from 'xior';

const instance = xior.create({
  timeout: 120 * 1000, // set default timeout
});

await instance.post(
  'http://httpbin.org',
  {
    a: 1,
    b: 2,
  },
  {
    timeout: 60 * 1000, // override default timeout 120 * 1000
  }
);

Cancel request:

import xior from 'xior';
const instance = xior.create();

const controller = new AbortController();

xiorInstance.get('http://httpbin.org', { signal: controller.signal }).then((res) => {
  console.log(res.data);
});

class CancelRequestError extends Error {}
controller.abort(new CancelRequestError()); // abort request with custom error

Encrypt and Decrypt Example

We can use interceptors easily to handle encrypt/decrypt.

Create encryption.ts:

// encryption.ts
export const SECRET = '&*&*^SDxsdasdas776';

export function encrypt(data: string) {
  return data + '____' + SECRET;
}

export function decrypt(data: string, s?: string) {
  return data.replace('____' + (s || SECRET), '');
}

Create xior-instance.ts:

import xior from 'xior';

import { SECRET, encrypt, decrypt } from './encryption';

export const instance = xior.create();

instance.interceptors.request.use((req) => {
  req.headers['X'] = SECRET;

  if (req.url && req.data) {
    const result = JSON.stringify(req.data);
    const blob = encrypt(result);
    req.data = { blob };
  }

  return req;
});

instance.interceptors.response.use((res) => {
  if (res.request.url && res.data?.blob) {
    res.data = decrypt(res.data.blob);
    try {
      res.data = JSON.parse(res.data);
    } catch (e) {
      console.error(e);
    }
  }
  return res;
});

Check test code in tests/src/tests/encrypt-decrypt/

Plugins

xior offers a variety of built-in plugins to enhance its functionality:

• Error retry plugin
• Request dedupe plugin
• Request throttle plugin
• Error cache plugin
• Cache plugin
• Upload and download progress plugin
• Mock plugin

Usage:

import xior from 'xior';
import errorRetryPlugin from 'xior/plugins/error-retry';
import throttlePlugin from 'xior/plugins/throttle';
import cachePlugin from 'xior/plugins/cache';
import uploadDownloadProgressPlugin from 'xior/plugins/progress';

const http = xior.create();

http.plugins.use(errorRetryPlugin());
http.plugins.use(throttlePlugin());
http.plugins.use(cachePlugin());
http.plugins.use(uploadDownloadProgressPlugin());

Error retry plugin

Retry the failed request with special times

API:

function errorRetryPlugin(options: {
  retryTimes?: number;
  retryInterval?: number | ((errorCount: number) => number);
  enableRetry?: boolean | (config: XiorRequestConfig, error: XiorError | Error) => boolean;
  onRetry?: (config: XiorRequestConfig, error: XiorError | Error, count: number) => void;
}): XiorPlugin;

The options object:

Basic usage:

import xior from 'xior';
import errorRetryPlugin from 'xior/plugins/error-retry';

const http = xior.create();
http.plugins.use(
  errorRetryPlugin({
    retryTimes: 3,
    // retryInterval: 3000,
    retryInterval(count) {
      return count * 3000;
    },
    onRetry(config, error, count) {
      console.log(`${config.method} ${config.url} retry ${count} times`);
    },
  })
);

// if request error, max retry 3 times until success
http.get('/api1');

// if request error, will not retry, because `retryTimes: 0`
http.get('/api2', { retryTimes: 0 });

// if POST request error, will not retry
http.post('/api1');

// Use `enableRetry: true` to support post method, max retry 5 times until success
http.post('/api1', null, { retryTimes: 5, enableRetry: true });

Use CDN:

Using jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>
<!-- Load plugin -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/plugins/error-retry.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorErrorRetry());
</script>

Using unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Load plugin -->
<script src="https://unpkg.com/[email protected]/plugins/error-retry.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorErrorRetry());
</script>

Request throttle plugin

Throttle GET requests(or custom) most once per threshold milliseconds, filter repeat requests in certain time.

API:

function throttleRequestPlugin(options: {
  /** threshold in milliseconds, default: 1000ms */
  threshold?: number;
  /**
   * check if we need enable throttle, default only `GET` method or`isGet: true` enable
   */
  enableThrottle?: boolean | ((config?: XiorRequestConfig) => boolean);
  throttleCache?: ICacheLike<RecordedCache>;
}): XiorPlugin;

The options object:

You can override default value in each request's own config (Except throttleCache)

Basic usage:

import xior from 'xior';
import throttlePlugin from 'xior/plugins/throttle';

const http = xior.create();
http.plugins.use(throttlePlugin());

http.get('/'); // make real http request
http.get('/'); // response from cache
http.get('/'); // response from cache

http.post('/'); // make real http request
http.post('/'); // make real http request
http.post('/'); // make real http request

http.post('/', null, {
  enableThrottle: true,
}); // make real http request
http.post('/', null, {
  enableThrottle: true,
}); // response from cache
http.post('/', null, {
  enableThrottle: true,
}); // response from cache

// make post method as get method use `{isGet: true}`,
// useful when some API is get data but the method is `post`
http.post('/get', null, {
  isGet: true,
}); // make real http request
http.post('/get', null, {
  isGet: true,
}); // response from cache
http.post('/get', null, {
  isGet: true,
}); // response from cache

Use CDN:

Using jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>
<!-- Load plugin -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/plugins/throttle.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorThrottle());
</script>

Using unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Load plugin -->
<script src="https://unpkg.com/[email protected]/plugins/throttle.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorThrottle());
</script>

Request dedupe plugin

Prevents having multiple identical requests on the fly at the same time.

API:

function dedupeRequestPlugin(options: {
  /**
   * check if we need enable dedupe, default only `GET` method or`isGet: true` enable
   */
  enableDedupe?: boolean | ((config?: XiorRequestConfig) => boolean);
  onDedupe?: (config: XiorRequestConfig) => void;
}): XiorPlugin;

Basic usage:

import xior from 'xior';
import dedupePlugin from 'xior/plugins/dedupe';

const http = xior.create();
http.plugins.use(
  dedupePlugin({
    onDedupe(config) {
      console.log(`Dedupe ${config.method} ${config.url}`);
    },
  })
);

http.get('/'); // make real http request
http.get('/'); // response from previous if previous request return response
http.get('/'); // response from previous if previous request return response

http.post('/'); // make real http request
http.post('/'); // make real http request
http.post('/'); // make real http request

Use CDN:

Using jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>
<!-- Load plugin -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/plugins/dedupe.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorDedupe());
</script>

Using unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Load plugin -->
<script src="https://unpkg.com/[email protected]/plugins/dedupe.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorDedupe());
</script>

Error cache plugin

When request error, if have cached data then use the cached data

API:

function errorCachePlugin(options: {
  enableCache?: boolean | ((config?: XiorRequestConfig) => boolean);
  defaultCache?: ICacheLike<XiorPromise>;
}): XiorPlugin;

The options object:

Basic usage:

import xior from 'xior';
import errorCachePlugin from 'xior/plugins/error-cache';

const http = xior.create();
http.plugins.use(errorCachePlugin({}));

http.get('/users'); // make real http request, and cache the response
const res = await http.get('/users'); // if request error, use the cache data
if (res.fromCache) {
  // if `fromCache` is true, means data from cache!
  console.log('data from cache!');
  // and get what's the error
  console.log('error', res.error);
}

http.post('/users'); // no cache for post

http.post('/users', { isGet: true }); // but with `isGet: true` can let plugins know this is `GET` behavior! then will cache data

Use CDN:

Using jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>
<!-- Load plugin -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/plugins/error-cache.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorErrorCache());
</script>

Using unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Load plugin -->
<script src="https://unpkg.com/[email protected]/plugins/error-cache.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorErrorCache());
</script>

Cache plugin

Makes xior cacheable

Good to Know: Next.js already support cache for fetch in server side. More detail

Different with error-cache plugin: this plugin will use the data in cache if the cache data not expired.

API:

function cachePlugin(options: {
  enableCache?: boolean | ((config?: XiorRequestConfig) => boolean);
  defaultCache?: ICacheLike<XiorPromise>;
}): XiorPlugin;

The options object:

Basic usage:

import xior from 'xior';
import cachePlugin from 'xior/plugins/cache';

const http = xior.create();
http.plugins.use(cachePlugin());

http.get('/users'); // make real http request
http.get('/users'); // get cache from previous request
http.get('/users', { enableCache: false }); // disable cache manually and the real http request

http.post('/users'); // default no cache for post

// enable cache manually in post request
http.post('/users', { enableCache: true }); // make real http request
const res = await http.post('/users', { enableCache: true }); // get cache from previous request
if (res.fromCache) {
  // if `fromCache` is true, means data from cache!
  console.log('data from cache!');
}

Advanced:

import xior from 'xior';
import cachePlugin from 'xior/plugins/cache';
import { lru } from 'tiny-lru';

const http = xior.create({
  baseURL: 'https://example-domain.com/api',
  headers: { 'Cache-Control': 'no-cache' },
});
http.plugins.use(
  cachePlugin({
    // disable the default cache
    enableCache: false,
  })
);

http.get('/users', { enableCache: true }); // manually enable cache for this request
http.get('/users', { enableCache: true }); // get cache from  previous request

const cacheA = lru(100);
// a actual request made and cached due to force update configured
http.get('/users', { enableCache: true, defaultCache: cacheA, forceUpdate: true });

Upload and download progress plugin

Enable upload and download progress like axios, but the progress is simulated, This means it doesn't represent the actual progress but offers a user experience similar to libraries like axios.

API:

function progressPlugin(options: {
  /** default: 5*1000 ms */
  progressDuration?: number;
}): XiorPlugin;

The options object:

Basic usage:

import xior from 'xior';
import uploadDownloadProgressPlugin from 'xior/plugins/progress';

const http = xior.create({});
http.plugins.use(uploadDownloadProgressPlugin());

const formData = FormData();
formData.append('file', fileObject);
formData.append('field1', 'val1');
formData.append('field2', 'val2');

http.post('/upload', formData, {
  // simulate upload progress to 99% in 10 seconds, default is 5 seconds
  progressDuration: 10 * 1000,
  onUploadProgress(e) {
    console.log(`Upload progress: ${e.progress}%`);
  },
  // onDownloadProgress(e) {
  //   console.log(`Download progress: ${e.progress}%`);
  // },
});

Use CDN:

Using jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>
<!-- Load plugin -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/plugins/progress.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorProgress());
</script>

Using unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Load plugin -->
<script src="https://unpkg.com/[email protected]/plugins/progress.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  xior.plugins.use(xiorProgress());
</script>

Mock plugin

This plugin let you eaisly mock requests

Usage:

with GET:

import xior from 'xior';
import MockPlugin from 'xior/plugins/mock';

const instance = xior.create();
const mock = new MockPlugin(instance);

// Mock any GET request to /users
// arguments for reply are (status, data, headers)
mock.onGet('/users').reply(
  200,
  {
    users: [{ id: 1, name: 'John Smith' }],
  },
  {
    'X-Custom-Response-Header': '123',
  }
);

instance.get('/users').then(function (response) {
  console.log(response.data);
  console.log(response.headers.get('X-Custom-Response-Header')); // 123
});

// Mock GET request to /users when param `searchText` is 'John'
// arguments for reply are (status, data, headers)
mock.onGet('/users', { params: { searchText: 'John' } }).reply(200, {
  users: [{ id: 1, name: 'John Smith' }],
});

instance.get('/users', { params: { searchText: 'John' } }).then(function (response) {
  console.log(response.data);
});

with POST:

import xior from 'xior';
import MockPlugin from 'xior/plugins/mock';

const instance = xior.create();
const mock = new MockPlugin(instance);

// Mock any POST request to /users
// arguments for reply are (status, data, headers)
mock.onPost('/users').reply(
  200,
  {
    users: [{ id: 1, name: 'John Smith' }],
  },
  {
    'X-Custom-Response-Header': '123',
  }
);

instance.post('/users').then(function (response) {
  console.log(response.data);
  console.log(response.headers.get('X-Custom-Response-Header')); // 123
});

// Mock POST request to /users when param `searchText` is 'John'
// arguments for reply are (status, data, headers)
mock.onPost('/users', null, { params: { searchText: 'John' } }).reply(200, {
  users: [{ id: 1, name: 'John Smith' }],
});

instance.get('/users', null, { params: { searchText: 'John' } }).then(function (response) {
  console.log(response.data);
});

// Mock POST request to /users when body `searchText` is 'John'
// arguments for reply are (status, data, headers)
mock.onPost('/users', { searchText: 'John' }).reply(200, {
  users: [{ id: 1, name: 'John Smith' }],
});

instance.get('/users', { searchText: 'John' }).then(function (response) {
  console.log(response.data);
});

More details, check here.

Use CDN:

Using jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/xior.umd.js"></script>
<!-- Load plugin -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/plugins/mock.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  const mock = new xiorMock(xior);
</script>

Using unpkg CDN:

<script src="https://unpkg.com/[email protected]/dist/xior.umd.js"></script>

<!-- Load plugin -->
<script src="https://unpkg.com/[email protected]/plugins/mock.umd.js"></script>

<!-- Usage -->
<script>
  console.log(xior.VERSION);

  const mock = new xiorMock(xior);
</script>

Create your own custom plugin

xior let you easily to create custom plugins.

Here are examples:

1. Simple Logging plugin:

import xior from 'xior';

const instance = xior.create();
instance.plugins.use(function logPlugin(adapter, instance) {
  return async (config) => {
    const start = Date.now();
    const res = await adapter(config);
    console.log('%s %s %s take %sms', config.method, config.url, res.status, Date.now() - start);
    return res;
  };
});

2. Check built-in plugins get more inspiration:

Check src/plugins

Helper functions

xior has built-in helper functions, may useful for you:

import lru from 'tiny-lru';
import {
  encodeParams,
  merge as deepMerge,
  delay as sleep,
  buildSortedURL,
  isAbsoluteURL,
  joinPath,
  isXiorError,
} from 'xior';

FAQ

xior frequently asked questions.

1. Is xior 100% compatiable with axios?

No, but xior offers a similar API like axios: axios.create / axios.interceptors / .get/post/put/patch/delete/head/options.

2. Can I use xior in projects like Bun, Expo, React Native, Next.js, Vue, or Nuxt.js?

Yes, xior works anywhere where the native fetch API is supported. Even if the environment doesn't support fetch, you can use a fetch polyfill like for older browsers.

3. How do I handle responses with types like 'stream', 'document', 'arraybuffer', or 'blob'?

To handle such responses, use the responseType: 'stream' option in your request:

import xior from 'xior';

const http = xior.create({ baseURL });

const { response } = await http.post<{ file: any; body: Record<string, string> }>(
  '/stream/10',
  null,
  { responseType: 'stream' }
);
const reader = response.body!.getReader();
let chunk;
for await (chunk of readChunks(reader)) {
  console.log(`received chunk of size ${chunk.length}`);
}

5. How do I support older browsers?

You can use a polyfill for the fetch API. Check the file src/tests/polyfill.test.ts for a potential example.

6. Why is xior named "xior"?

The original name axior was unavailable on npm, so when removed the "a": ~~a~~xior.

7. Where can I ask additional questions?

If you have any questions, feel free to create issues.

Migrate from axios to xior

GET

axios:

import axios from 'axios';

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

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

// Want to use async/await? Add the `async` keyword to your outer function/method.
async function getUser() {
  try {
    const response = await axios.get('/user?ID=12345');
    console.log(response);
  } catch (error) {
    console.error(error);
  }
}

xior:

import axios from 'xior';

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

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

// Want to use async/await? Add the `async` keyword to your outer function/method.
async function getUser() {
  try {
    const response = await axios.get('/user?ID=12345');
    console.log(response);
  } catch (error) {
    console.error(error);
  }
}

POST

axios:

import axios from 'axios';

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

xior:

import axios from 'xior';

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

axios(requestObj): axios({ method: 'get', params: { a: 1 } })

axios:

import axios from 'axios';

await axios({ method: 'get', params: { a: 1 } });

xior:

import xior from 'xior';

const axios = xior.create();

await axios.request({ method: 'get', params: { a: 1 } });

Creating an instance

axios:

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

xior:

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

Get response headers

axios:

import axios from 'axios';

const axiosInstance = axios.create({
  baseURL: 'https://apiexampledomian.com/api',
});

const { data, headers } = await axiosInstance.get('/');

console.log(headers['X-Header-Name']);

xior:

import xior from 'xior';

const xiorInstance = xior.create({
  baseURL: 'https://apiexampledomian.com/api',
});

const { data, headers } = await xiorInstance.get('/');

console.log(headers.get('X-Header-Name'));

Download file with responseType: 'stream' (In Node.JS)

axios:

import axios from 'axios';

// GET request for remote image in node.js
axios({
  method: 'get',
  url: 'https://bit.ly/2mTM3nY',
  responseType: 'stream',
}).then(function (response) {
  response.data.pipe(fs.createWriteStream('ada_lovelace.jpg'));
});

xior:

import xior from 'xior';
const axios = xior.create();

axios
  .get('https://bit.ly/2mTM3nY', {
    responseType: 'stream',
  })
  .then(async function ({ response, config }) {
    const buffer = Buffer.from(await response.arrayBuffer());
    return writeFile('ada_lovelace.jpg', buffer);
  });

Use stream

axios:

import axios from 'axios';
import { Readable } from 'stream';

const http = axios.create();

async function getStream(url: string, params: Record<string, any>) {
  const { data } = await http.get(url, {
    params,
    responseType: 'stream',
  });
  return data;
}

xior:

import axxios from 'xior';
import { Readable } from 'stream';

const http = axios.create();

async function getStream(url: string, params: Record<string, any>) {
  const { response } = await http.get(url, {
    params,
    responseType: 'stream',
  });
  const stream = convertResponseToReadable(response);
  return stream;
}

function convertResponseToReadable(response: Response): Readable {
  const reader = response.body.getReader();
  return new Readable({
    async read() {
      const { done, value } = await reader.read();
      if (done) {
        this.push(null);
      } else {
        this.push(Buffer.from(value));
      }
    },
  });
}

Migrate from fetch to xior

GET

fetch:

async function logMovies() {
  const response = await fetch('http://example.com/movies.json?page=1&perPage=10');
  const movies = await response.json();
  console.log(movies);
}

xior:

import xior from 'xior';

const http = xior.create({
  baseURL: 'http://example.com',
});
async function logMovies() {
  const { data: movies } = await http.get('/movies.json', {
    params: {
      page: 1,
      perPage: 10,
    },
  });
  console.log(movies);
}

POST

fetch:

// Example POST method implementation:
async function postData(url = '', data = {}) {
  // Default options are marked with *
  const response = await fetch(url, {
    method: 'POST', // *GET, POST, PUT, DELETE, etc.
    mode: 'cors', // no-cors, *cors, same-origin
    cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
    credentials: 'same-origin', // include, *same-origin, omit
    headers: {
      'Content-Type': 'application/json',
      // 'Content-Type': 'application/x-www-form-urlencoded',
    },
    redirect: 'follow', // manual, *follow, error
    referrerPolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url
    body: JSON.stringify(data), // body data type must match "Content-Type" header
  });
  return response.json(); // parses JSON response into native JavaScript objects
}

postData('https://example.com/answer', { answer: 42 }).then((data) => {
  console.log(data); // JSON data parsed by `data.json()` call
});

xior:

import xior from 'xior';

const http = xior.create({
  baseURL: 'http://example.com',
});

http
  .post(
    '/answer',
    { answer: 42 },
    {
      mode: 'cors', // no-cors, *cors, same-origin
      cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
      credentials: 'same-origin', // include, *same-origin, omit
      headers: {
        'Content-Type': 'application/json',
        // 'Content-Type': 'application/x-www-form-urlencoded',
      },
      redirect: 'follow', // manual, *follow, error
      referrerPolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url
    }
  )
  .then(({ data }) => {
    console.log(data);
  });

Abort a fetch

fetch:

const controller = new AbortController();
const signal = controller.signal;
const url = 'video.mp4';

const downloadBtn = document.querySelector('#download');
const abortBtn = document.querySelector('#abort');

downloadBtn.addEventListener('click', async () => {
  try {
    const response = await fetch(url, { signal });
    console.log('Download complete', response);
  } catch (error) {
    console.error(`Download error: ${error.message}`);
  }
});

abortBtn.addEventListener('click', () => {
  controller.abort();
  console.log('Download aborted');
});

xior:

import xior from 'xior';

const http = xior.create();

const controller = new AbortController();
const signal = controller.signal;
const url = 'video.mp4';

const downloadBtn = document.querySelector('#download');
const abortBtn = document.querySelector('#abort');

downloadBtn.addEventListener('click', async () => {
  try {
    const response = await http.get(url, { signal });
    console.log('Download complete', response);
  } catch (error) {
    console.error(`Download error: ${error.message}`);
  }
});

abortBtn.addEventListener('click', () => {
  controller.abort();
  console.log('Download aborted');
});

Sending a request with credentials included

fetch:

fetch('https://example.com', {
  credentials: 'include',
});

xior:

import xior from 'xior';

const http = xior.create();

http.get('https://example.com', {
  credentials: 'include',
});

Uploading a file

fetch:

async function upload(formData) {
  try {
    const response = await fetch('https://example.com/profile/avatar', {
      method: 'PUT',
      body: formData,
    });
    const result = await response.json();
    console.log('Success:', result);
  } catch (error) {
    console.error('Error:', error);
  }
}

const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');

formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);

upload(formData);

xior:

import xior from 'xior';

const http = xior.create({
  baseURL: 'https://example.com',
});

async function upload(formData) {
  try {
    const { data: result } = await http.put('/profile/avatar', formData);
    console.log('Success:', result);
  } catch (error) {
    console.error('Error:', error);
  }
}

const formData = new FormData();
const fileField = document.querySelector('input[type="file"]');

formData.append('username', 'abc123');
formData.append('avatar', fileField.files[0]);

upload(formData);

Processing a text file line by line

fetch:

async function* makeTextFileLineIterator(fileURL) {
  const utf8Decoder = new TextDecoder('utf-8');
  const response = await fetch(fileURL);
  const reader = response.body.getReader();
  let { value: chunk, done: readerDone } = await reader.read();
  chunk = chunk ? utf8Decoder.decode(chunk) : '';

  const newline = /\r?\n/gm;
  let startIndex = 0;
  let result;

  while (true) {
    const result = newline.exec(chunk);
    if (!result) {
      if (readerDone) break;
      const remainder = chunk.substr(startIndex);
      ({ value: chunk, done: readerDone } = await reader.read());
      chunk = remainder + (chunk ? utf8Decoder.decode(chunk) : '');
      startIndex = newline.lastIndex = 0;
      continue;
    }
    yield chunk.substring(startIndex, result.index);
    startIndex = newline.lastIndex;
  }

  if (startIndex < chunk.length) {
    // Last line didn't end in a newline char
    yield chunk.substr(startIndex);
  }
}

async function run() {
  for await (const line of makeTextFileLineIterator(urlOfFile)) {
    processLine(line);
  }
}

run();

xior:

Good to Know: add {responseType: 'stream'} options will tell xior no need process response, and return original response in format {response}

import xior from 'xior';

const http = xior.create();

async function* makeTextFileLineIterator(fileURL) {
  const utf8Decoder = new TextDecoder('utf-8');
  const { response } = await http.get(fileURL, { responseType: 'stream' });
  const reader = response.body.getReader();
  let { value: chunk, done: readerDone } = await reader.read();
  chunk = chunk ? utf8Decoder.decode(chunk) : '';

  const newline = /\r?\n/gm;
  let startIndex = 0;
  let result;

  while (true) {
    const result = newline.exec(chunk);
    if (!result) {
      if (readerDone) break;
      const remainder = chunk.substr(startIndex);
      ({ value: chunk, done: readerDone } = await reader.read());
      chunk = remainder + (chunk ? utf8Decoder.decode(chunk) : '');
      startIndex = newline.lastIndex = 0;
      continue;
    }
    yield chunk.substring(startIndex, result.index);
    startIndex = newline.lastIndex;
  }

  if (startIndex < chunk.length) {
    // Last line didn't end in a newline char
    yield chunk.substr(startIndex);
  }
}

async function run() {
  for await (const line of makeTextFileLineIterator(urlOfFile)) {
    processLine(line);
  }
}

run();

Thanks

Without the support of these resources, xior wouldn't be possible:

• axios
• axios-extensions
• axios-mock-adapter
• ts-deepmerge
• tiny-lru
• bunchee
• fetch MDN docs