yarl

yarl

YARL, Carl!

Promise based, easy to use, with built-in multipart/form-data and gzip/deflate handling support - yet another request library (yarl).

Features

• Promise based (i.e. async/await ready)
• Follows redirects
• multipart/form-data built-in support
• json parse
• gzip/deflate handling
• download method
• etc.

Install

$ npm install yarl --save

Usage

const { get, download } = require('yarl');

get('https://api.github.com/users/strikeentco', { json: true })
  .then(({body}) => {
    body.name; // -> Alexey Bystrov
    return download(body.avatar_url, `./${body.login}.jpg`);
  })
  .then((res) => {
    res.body; // -> The data successfully written to file.
  });

const { post } = require('yarl');
const { createReadStream } = require('fs');
const { get } = require('https');

post('127.0.0.1:3000', {
  body: {
    photo: get('https://avatars.githubusercontent.com/u/2401029'),
    fixture: createReadStream('./test/fixture/fixture.jpg')
  },
  multipart: true
});

API

yarl(url, [options])

By default it's a GET request, but you can change it in options.

If http:// will be missed in url, it will be automatically added.

Params:

• url (String|Object) - The URL to request or a http.request options object.
• [options] (Object) - Any of the http.request options options and:
  • query (String|Object) - Correct urlencoded string or query Object. Object will be stringified with querystring.stringify. This will override the query string in url.
  • body (String|Object|Array|Buffer) - Body that will be sent with a POST, PUT, PATCH, DELETE request. If content-length or transfer-encoding is not set in options.headers, transfer-encoding will be set as chunked.
  • multipart (Boolean) - If true, body object will be sent as multipart/form-data.
  • form (Boolean) - If true, body object will be sent as application/x-www-form-urlencoded.
  • json (Boolean) - If true, body object will be sent as application/json. Parse response body with JSON.parse and set accept header to application/json. If used in conjunction with the form option, the body will the stringified as querystring and the response parsed as JSON.
  • forceRedirect (Boolean) - If true, will follow redirects for all methods, otherwise for GET and HEAD only.
  • redirectCount (Number) - Number of allowed redirects. By default 10.
  • includeHeaders (Boolean) - If true, headers property will be added to response object, otherwise only body will.
  • buffer (Boolean) - If true, the body is returned as a Buffer.
  • download (String|WritableStream) - Response body will be written to specified WritableStream or new WritableStream will be created with specified path.
  • gzip (Boolean) - Unzip response body with gzip. Useful when server doesn't specify Content-Encoding header.
  • deflate (Boolean) - Unzip response body with deflate. Useful when server doesn't specify Content-Encoding header.

yarl.get(url, [options])

Simmilar to yarl(url, { method: 'GET' }).

yarl.head(url, [options])

Simmilar to yarl(url, { method: 'HEAD', includeHeaders: true }).

yarl.post(url, [options])

Simmilar to yarl(url, { method: 'POST' }).

yarl.put(url, [options])

Simmilar to yarl(url, { method: 'PUT' }).

yarl.patch(url, [options])

Simmilar to yarl(url, { method: 'PATCH' }).

yarl.delete(url, [options])

Simmilar to yarl(url, { method: 'DELETE' }).

yarl.download(url, path)

Simmilar to yarl(url, { method: 'GET', download: path }).

XML

You can use the xml-parser module to parse XML data:

const yarl = require('yarl');
const parse = require('xml-parser');

function xmlParse(xml) {
  return Object.assign({}, xml, {
    body: parse(xml.body)
  });
}

yarl('http://api.openweathermap.org/data/2.5/weather?q=London&mode=xml').then(xmlParse).then((r) => {
  r.body.root.children[1].attributes.value; // -> temperature
});

// or

yarl('http://api.openweathermap.org/data/2.5/weather?q=London&mode=xml').then((r) => {
  parse(r.body).root.children[1].attributes.value; // -> temperature
});

Proxies

You can use the tunnel module with the agent option to work with proxies:

const yarl = require('yarl');
const tunnel = require('tunnel');

yarl('github.com', {
  agent: tunnel.httpOverHttp({
    proxy: {
      host: 'localhost'
    }
  })
});

Cookies

You can use the cookie module to include cookies in a request:

const yarl = require('yarl');
const cookie = require('cookie');

yarl('github.com', {
  headers: {
    cookie: cookie.serialize('foo', 'bar')
  }
});

OAuth

You can use the oauth-1.0a module to create a signed OAuth request:

const yarl = require('yarl');
const crypto  = require('crypto');
const OAuth = require('oauth-1.0a');

const oauth = OAuth({
  consumer: {
    key: process.env.CONSUMER_KEY,
    secret: process.env.CONSUMER_SECRET
  },
  signature_method: 'HMAC-SHA1',
  hash_function: (baseString, key) => crypto.createHmac('sha1', key).update(baseString).digest('base64')
});

const token = {
  key: process.env.ACCESS_TOKEN,
  secret: process.env.ACCESS_TOKEN_SECRET
};

const url = 'https://api.twitter.com/1.1/statuses/home_timeline.json';

yarl(url, {
  headers: oauth.toHeader(oauth.authorize({ url, method: 'GET' }, token)),
  json: true
});

Other examples

const yarl = require('yarl');

(async () => {
  const { body: photo } = await yarl('https://avatars.githubusercontent.com/u/2401029', { buffer: true });
  await yarl('127.0.0.1:3000', { body: { photo }, multipart: true })
})()

const { createReadStream } = require('fs');
const { get } = require('https');
const { post } = require('yarl');

const options = {
  body: {
    photo: {
      value: [
        createReadStream('./test/fixture/fixture.jpg'),
        get('https://avatars.githubusercontent.com/u/2401029')
      ],
      options: { filename: 'photo.jpg' }
    },
    field: [1, 2, '3', 4, null]
  },
  multipart: true,
  json: true
};

post('127.0.0.1:3000', options);

License

The MIT License (MIT)
Copyright (c) 2015-2017 Alexey Bystrov