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README.md

superagent

build status code coverage code style styled with prettier made with lass license

Small progressive client-side HTTP request library, and Node.js module with the same API, sporting many high-level HTTP client features

Table of Contents

Install

npm:

npm install superagent

yarn:

yarn add superagent

Usage

Node

const superagent = require('superagent');

// callback
superagent
  .post('/api/pet')
  .send({ name: 'Manny', species: 'cat' }) // sends a JSON post body
  .set('X-API-Key', 'foobar')
  .set('accept', 'json')
  .end((err, res) => {
    // Calling the end function will send the request
  });

// promise with then/catch
superagent.post('/api/pet').then(console.log).catch(console.error);

// promise with async/await
(async () => {
  try {
    const res = await superagent.post('/api/pet');
    console.log(res);
  } catch (err) {
    console.error(err);
  }
})();

Browser

The browser-ready, minified version of superagent is only 6 KB (minified and gzipped)!

Browser-ready versions of this module are available via jsdelivr, unpkg, and also in the node_modules/superagent/dist folder in downloads of the superagent package.

Note that we also provide unminified versions with .js instead of .min.js file extensions.

VanillaJS

This is the solution for you if you're just using <script> tags everywhere!

<script src="https://polyfill.io/v3/polyfill.min.js?features=Array.from,Promise,Symbol,Object.setPrototypeOf,Object.getOwnPropertySymbols"></script>
<script src="https://cdn.jsdelivr.net/npm/superagent"></script>
<!-- if you wish to use unpkg.com instead: -->
<!-- <script src="https://unpkg.com/superagent"></script> -->
<script type="text/javascript">
  (function() {
    // superagent is exposed as `window.superagent`
    // if you wish to use "request" instead please
    // uncomment the following line of code:
    // `window.request = superagent;`
    superagent
      .post('/api/pet')
      .send({ name: 'Manny', species: 'cat' }) // sends a JSON post body
      .set('X-API-Key', 'foobar')
      .set('accept', 'json')
      .end(function (err, res) {
        // Calling the end function will send the request
      });
  })();
</script>

Bundler

If you are using browserify, webpack, rollup, or another bundler, then you can follow the same usage as Node above.

Supported Platforms

  • Node: v6.x+

  • Browsers (see .browserslistrc):

    npx browserslist
    and_chr 71
    and_ff 64
    and_qq 1.2
    and_uc 11.8
    android 67
    android 4.4.3-4.4.4
    baidu 7.12
    bb 10
    bb 7
    chrome 73
    chrome 72
    chrome 71
    edge 18
    edge 17
    firefox 66
    firefox 65
    ie 11
    ie 10
    ie 9
    ie_mob 11
    ie_mob 10
    ios_saf 12.0-12.1
    ios_saf 11.3-11.4
    op_mini all
    op_mob 46
    op_mob 12.1
    opera 58
    opera 57
    safari 12
    safari 11.1
    samsung 8.2
    samsung 7.2-7.4

Required Browser Features

We recommend using https://polyfill.io (specifically with the bundle mentioned in VanillaJS above):

<script src="https://polyfill.io/v3/polyfill.min.js?features=Array.from,Promise,Symbol,Object.setPrototypeOf,Object.getOwnPropertySymbols"></script>
  • IE 9-10 requires a polyfill for Promise, Array.from, Symbol, Object.getOwnPropertySymbols, and Object.setPrototypeOf
  • IE 9 requires a polyfill for window.FormData (we recommend formdata-polyfill)

Plugins

SuperAgent is easily extended via plugins.

const nocache = require('superagent-no-cache');
const superagent = require('superagent');
const prefix = require('superagent-prefix')('/static');

superagent
  .get('/some-url')
  .query({ action: 'edit', city: 'London' }) // query string
  .use(prefix) // Prefixes *only* this request
  .use(nocache) // Prevents caching of *only* this request
  .end((err, res) => {
    // Do something
  });

Existing plugins:

Please prefix your plugin with superagent-* so that it can easily be found by others.

For SuperAgent extensions such as couchdb and oauth visit the wiki.

Upgrading from previous versions

Our breaking changes are mostly in rarely used functionality and from stricter error handling.

  • 4.x to 5.x:
    • We've implemented the build setup of Lass to simplify our stack and linting
    • Unminified browserified build size has been reduced from 48KB to 20KB (via tinyify and the latest version of Babel using @babel/preset-env and .browserslistrc)
    • Linting support has been added using caniuse-lite and eslint-plugin-compat
    • We can now target what versions of Node we wish to support more easily using .babelrc
  • 3.x to 4.x:
    • Ensure you're running Node 6 or later. We've dropped support for Node 4.
    • We've started using ES6 and for compatibility with Internet Explorer you may need to use Babel.
    • We suggest migrating from .end() callbacks to .then() or await.
  • 2.x to 3.x:
    • Ensure you're running Node 4 or later. We've dropped support for Node 0.x.
    • Test code that calls .send() multiple times. Invalid calls to .send() will now throw instead of sending garbage.
  • 1.x to 2.x:
    • If you use .parse() in the browser version, rename it to .serialize().
    • If you rely on undefined in query-string values being sent literally as the text "undefined", switch to checking for missing value instead. ?key=undefined is now ?key (without a value).
    • If you use .then() in Internet Explorer, ensure that you have a polyfill that adds a global Promise object.
  • 0.x to 1.x:
    • Instead of 1-argument callback .end(function(res){}) use .then(res => {}).

Contributors

Name
Kornel Lesiński
Peter Lyons
Hunter Loftis
Nick Baugh

License

MIT © TJ Holowaychuk

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