meixger/node-fetch-cookies

Node.js 18 fetch and combined set-cookie header

When fetching an endpoint which sets multiple cookies, the response has only a single combined set-cookie header.

Example:

1. add 2 cookies in endpoint

"set-cookie": [
  "user=alice; Path=/; Expires=Thu, 01 Jun 2023 10:00:00 GMT; HttpOnly",
  "role=guest; Path=/"
]

2. fetch endpoint. response only has a single set-cookie header with values joined by ,

set-cookie: user=alice; Path=/; Expires=Thu, 01 Jun 2023 10:00:00 GMT; HttpOnly, role=guest; Path=/

3. a simple split by , is not enought as the cookie could contain additional , characters (eg. in the expires value)

0: user=alice; Path=/; Expires=Thu
1: 01 Jun 2023 10:00:00 GMT; HttpOnly
2: role=guest; Path=/

set-cookie-parser

The library set-cookie-parser has a splitCookiesString(combinedSetCookieHeader) function

references

• whatwg/fetch#973
• Wrong header split set-cookie node-fetch/node-fetch#349
• How to get an array of header values now that getAll has been removed? node-fetch/node-fetch#251
• https://stackoverflow.com/questions/63204093/how-to-get-set-multiple-set-cookie-headers-using-fetch-api
• https://nodejs.org/dist/latest-v18.x/docs/api/http.html#responsesetheadername-value