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superagent

elegant & feature rich browser / node HTTP with a fluent API

    8.1.2latest
    GitHub
    npm

Version published
Maintainers
7
Weekly downloads
9,214,327
increased by5.54%

Weekly downloads

Package description

What is superagent?

The superagent npm package is a small progressive client-side HTTP request library, and Node.js module with the same API, sporting many high-level HTTP client features. It is designed to make HTTP requests from both Node.js and browsers.

What are superagent's main functionalities?

GET requests

This feature allows you to make GET requests to retrieve data from a server. You can include query parameters and handle the response asynchronously.

superagent.get('/search').query({ query: 'Manny' }).end(function(err, res){ /* handling response */ });

POST requests

This feature is used to send POST requests to a server. You can send data as part of the request body and set custom headers.

superagent.post('/api/pets').send({ name: 'Manny', species: 'cat' }).set('X-API-Key', 'foobar').end(function(err, res){ /* handling response */ });

Handling responses

This feature allows you to handle responses from the server, checking if the request was successful and then acting on the data received.

superagent.get('/some-url').end(function(err, res){ if (res.ok) { console.log('yay got ' + JSON.stringify(res.body)); } else { console.log('Oh no! error ' + res.text); } });

Promises and async/await

Superagent can be used with promises and async/await syntax for better asynchronous control flow.

async function getData() { try { const res = await superagent.get('/some-url'); console.log(res.body); } catch (err) { console.error(err); } }

Pipelining requests

This feature allows you to pipe the response stream directly to a file or another writable stream.

superagent.get('/some-url').pipe(fs.createWriteStream('result.txt'))

Other packages similar to superagent

Readme

Source

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, supporting many high-level HTTP client features. Maintained for Forward Email and Lad.

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 50 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=WeakRef,BigInt"></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 102
    and_ff 101
    and_qq 10.4
    and_uc 12.12
    android 101
    chrome 103
    chrome 102
    chrome 101
    chrome 100
    edge 103
    edge 102
    edge 101
    firefox 101
    firefox 100
    firefox 91
    ios_saf 15.5
    ios_saf 15.4
    ios_saf 15.2-15.3
    ios_saf 15.0-15.1
    ios_saf 14.5-14.8
    ios_saf 14.0-14.4
    ios_saf 12.2-12.5
    kaios 2.5
    op_mini all
    op_mob 64
    opera 86
    opera 85
    safari 15.5
    safari 15.4
    samsung 17.0
    samsung 16.0
    

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=WeakRef,BigInt"></script>
  • WeakRef is not supported in Opera 85, iOS Safari 12.2-12.5
  • BigInt is not supported in iOS Safari 12.2-12.5

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

Please see GitHub releases page for the current changelog.

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

  • 6.0 to 6.1
  • 5.x to 6.x:
    • Retry behavior is still opt-in, however we now have a more fine-grained list of status codes and error codes that we retry against (see updated docs)
    • A specific issue with Content-Type matching not being case-insensitive is fixed
    • Set is now required for IE 9, see Required Browser Features for more insight
  • 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

Keywords

FAQs

Last updated on 15 Aug 2023

Did you know?

Socket installs a GitHub app to automatically flag issues on every pull request and report the health of your dependencies. Find out what is inside your node modules and prevent malicious activity before you update the dependencies.

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