fetch-cookie

What is fetch-cookie?

The fetch-cookie npm package is a wrapper around the Fetch API that adds automatic handling of cookies. It allows you to manage cookies in a more convenient way when making HTTP requests, which is particularly useful for maintaining session state across multiple requests.

What are fetch-cookie's main functionalities?

Automatic Cookie Handling

This feature allows you to automatically handle cookies when making HTTP requests. The cookies are stored and sent with subsequent requests to the same domain, making it easier to manage session state.

const fetch = require('fetch-cookie/node-fetch')(require('node-fetch'));

fetch('https://example.com')
  .then(res => res.text())
  .then(body => console.log(body));

Custom Cookie Jar

You can use a custom cookie jar to manage cookies. This is useful if you need to share cookies between different parts of your application or if you need to persist cookies between sessions.

const fetch = require('fetch-cookie/node-fetch')(require('node-fetch'));
const tough = require('tough-cookie');
const cookieJar = new tough.CookieJar();

fetch('https://example.com', { cookieJar })
  .then(res => res.text())
  .then(body => console.log(body));

Integration with Node.js and Browsers

The package can be used both in Node.js and in browser environments, making it versatile for different types of applications.

const fetch = require('fetch-cookie/node-fetch')(require('node-fetch'));

fetch('https://example.com')
  .then(res => res.text())
  .then(body => console.log(body));

Other packages similar to fetch-cookie

axios

Axios is a promise-based HTTP client for the browser and Node.js. It supports automatic transformation of JSON data, and you can use it with the 'axios-cookiejar-support' package to handle cookies similarly to fetch-cookie.

request

Request is a simplified HTTP client for Node.js with support for many features, including cookie handling via the 'request-promise-native' package. However, it is now deprecated and not recommended for new projects.

superagent

Superagent is a small, progressive client-side HTTP request library that also works in Node.js. It supports cookies out of the box and provides a similar level of functionality for managing cookies.

README

fetch-cookie

Decorator for a fetch function to support automatic cookies.

Description

This library is more suited to use with a Node.js fetch implementation like node-fetch, since the browser version is supposed to let a way to include cookies in requests.

Usage

var fetch = require('fetch-cookie')(require('node-fetch'))

If you want to customize the tough-cookie CookieJar instance (for example, with a custom store), you can inject it as a second argument.

All calls to fetch will store and send back cookies according to the URL.

Cookies and redirection

By default, cookies are not set correctly in the edge case where a response sets cookies and redirects to another URL. A real-life example of this behaviour is a login page setting a session cookie and redirecting.

The reason for this limitation is that the generic fetch API does not allow any way to hook into redirects. However, the node-fetch library does expose its own API which we can use.

Long story short: if cookies during indirection turns out to be a requirement for you, and if you are using node-fetch, then you can use the custom node-fetch decorator provided with this library:

var fetch = require('fetch-cookie/node-fetch')(require('node-fetch'))

Changelog

[0.7.0] - 2017-09-28

• Don't send empty cookies. ([#14])