Sending multiple cookies using Fetch in javascript

Question

I am trying to send two cookies using Fetch in Javascript. This is my function:

var cid_and_auth = process.argv[2];
const fetch = require("node-fetch");


function usePairService()
{
    cid = cid_and_auth.split(" ")[1];
    auth = cid_and_auth.split(" ")[0];
    (async () => {
        await fetch(AUTHENTICATIONURL, {
            method: 'POST',
            headers: {
                'Accept': 'application/json',
                'Content-Type': CONTENTTYPE,
                'wpay-meta': userPairwpaymeta,
                'cookie': 'cid'=cid,'auth'= auth,
            },
            body: JsonBody,
        })
        });;

}

I am trying to send cookies in the header, but it's giving an error, saying invalid left-hand die in expression. Any help will be appreciated.

'cid'=cid tries to assign the value of cid to the string value 'cid'. You cannot assign to a string, hence the error. — Felix Kling
– Felix Kling, Commented May 26, 2021 at 21:37
try 'cookie': `'cid'=${cid},'auth'= ${auth}`, use back ticks. read more about string literals — Neel Debnath
– Neel Debnath, Commented May 26, 2021 at 21:44
@FelixKling any idea how the syntax will be? I am trying to assign cid and auth to cookies. — Nilu
– Nilu, Commented May 26, 2021 at 21:45
@NeelDebnath I did this: 'cookie': 'cid'=${cid},'auth'= ${auth}. Not working, its showing expression expected. — Nilu
– Nilu, Commented May 26, 2021 at 21:47
Please check I have added back tick in the beginning and at the end of the code or check Felix's ans @Nilu — Neel Debnath
– Neel Debnath, Commented May 26, 2021 at 21:48

Felix Kling · Accepted Answer · 2021-05-26 21:44:15Z

2

'cid'=cid tries to assign the value of cid to the string value 'cid'. You cannot assign to a string, hence the error.

You have to build up a string of <key>=<value>; pairs. If you have each value in a variable you can either manually build the string, e.g. using template literals:

{
  // ...
  Cookie: `cid=${cid};auth=${auth}`,
 }

or you could create an object from those variables and programmatically create the string (which makes it a bit easier to add more values later on):

const cookieData = {cid, auth};
// ...
{
  // ...
  Cookie: Object.entries(cookieData)
    .map(([key, value]) => `${key}=${value}`)
    .join(';'),
}

answered May 26, 2021 at 21:44

Felix Kling

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1 Comment

KyleMit Over a year ago

FYI - You might want to use encodeURIComponent on the key and value incase they include = or ; symbols.

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