The set() method of the CookieStore interface sets a cookie with the given name and value or options object.

This method requires one of the following:

name

A string with the name of the cookie.

value

A string with the value of the cookie.

Or

options

An object containing:

domain Optional

A string containing the domain of the cookie.

expires Optional

A timestamp, given as Unix time in milliseconds, containing the expiration date of the cookie.

name

A string with the name of a cookie.

partitioned Optional

A boolean value that defaults to false. If set to true, the set cookie will be a partitioned cookie. See Cookies Having Independent Partitioned State (CHIPS) for more information.

path Optional

A string containing the path of the cookie.

sameSite Optional

One of the following SameSite values:

"strict"

Cookies will only be sent in a first-party context and not be sent along with requests initiated by third party websites.

"lax"

Cookies are not sent on normal cross-site subrequests (for example to load images or frames into a third party site), but are sent when a user is navigating to the origin site (i.e. when following a link).

"none"

Cookies will be sent in all contexts.

value

A string with the value of the cookie.

A Promise that resolves with undefined when setting the cookie completes.

TypeError

Thrown if setting the cookie with the given values fails.

SecurityError DOMException

Thrown if the origin does not serialize to a URL.

The following example sets a cookie by passing an object with name, value, expires, and domain.

const day = 24 * 60 * 60 * 1000;
cookieStore.set({
  name: "cookie1",
  value: "cookie1-value",
  expires: Date.now() + day,
  domain: "example.com",
});