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Next v15: await cookies.set() throws error

Answered
American black bear posted this in #help-forum
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American black bearOP
I have upgraded my codebase from Next.js 14 to Next.js 15. However some of my auth logic gives me an error. I cannot debug the error because I don't understand what it means, and it does not make much sense lol.

Here is the code that gives me an error:

const sessionCookie = lucia.createSessionCookie(result.session.id) // returns the type of Cookie

(await cookies()).set(
  sessionCookie.name,
  sessionCookie.value,
  sessionCookie.attributes
)


I have also tried abstracting (await cookies()).set(...) to:

const cookieStore = await cookies()
cookieStore().set(...)


and it also does not work.

The error is attached in the image.
Answered by American black bear
it gives me no error when writing:

cookieStore.set()
// instead of 

cookieStore().set()
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17 Replies

James4u
does your code look off because of no ;??
American black bearOP
I have semi disabled in prettier settings
it should not make a difference as far as I know it just looks weird because of the weird await syntax
but I have also tried this approach which fixes the syntax, but gives me the same error:

const sessionCookie = lucia.createSessionCookie(result.session.id)

const cookieStore = await cookies()
cookieStore().set(...)
James4u
in ⬆️ which error do you get?
American black bearOP
I think the docs are wrong
American black bearOP
American black bearOP
it gives me no error when writing:

cookieStore.set()
// instead of 

cookieStore().set()
Answer
James4u
oh man, you are right
no reason to use cookieStore()
American black bearOP
another quick question related to this is it okay if I just define cookieStore at the top of server actions file and then use it in functions?

"use server"

import {cookies} from "next/headers"

const cookieStore = await cookies()

export async function authenticate() {
  // ...
  cookieStore.set(...)
}
@James4u
James4u
nope, @American black bear
it should be inside your async function
American black bearOP
okay thank you
James4u
cookie should be inside request lifecycle