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chrome.cookies | API | Chrome for Developers

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Use the chrome.cookies API to query and modify cookies, and to be notified when they change.

cookies

To use the cookies API, declare the "cookies" permission in your manifest along with host permissions for any hosts whose cookies you want to access. For example:

{
  "name": "My extension",
  ...
  "host_permissions": [
    "*://*.google.com/"
  ],
  "permissions": [
    "cookies"
  ],
  ...
}

Partitioned cookies allow a site to mark that certain cookies should be keyed against the origin of the top-level frame. This means that, for example, if site A is embedded using an iframe in site B and site C, the embedded versions of a partitioned cookie from A can have different values on B and C.

By default, all API methods operate on unpartitioned cookies. The partitionKey property can be used to override this behavior.

For details on the general impact of partitioning for extensions, see Storage and Cookies.

You can find a simple example of using the cookies API in the examples/api/cookies directory. For other examples and for help in viewing the source code, see Samples.

Represents information about an HTTP cookie.

• The domain of the cookie (e.g. "www.google.com", "example.com").

• expirationDate

  number optional

  The expiration date of the cookie as the number of seconds since the UNIX epoch. Not provided for session cookies.

• True if the cookie is a host-only cookie (i.e. a request's host must exactly match the domain of the cookie).

• True if the cookie is marked as HttpOnly (i.e. the cookie is inaccessible to client-side scripts).

• The name of the cookie.

• The partition key for reading or modifying cookies with the Partitioned attribute.

• The path of the cookie.

• The cookie's same-site status (i.e. whether the cookie is sent with cross-site requests).

• True if the cookie is marked as Secure (i.e. its scope is limited to secure channels, typically HTTPS).

• True if the cookie is a session cookie, as opposed to a persistent cookie with an expiration date.

• The ID of the cookie store containing this cookie, as provided in getAllCookieStores().

• The value of the cookie.

Details to identify the cookie.

• The name of the cookie to access.

• The partition key for reading or modifying cookies with the Partitioned attribute.

• The ID of the cookie store in which to look for the cookie. By default, the current execution context's cookie store will be used.

• The URL with which the cookie to access is associated. This argument may be a full URL, in which case any data following the URL path (e.g. the query string) is simply ignored. If host permissions for this URL are not specified in the manifest file, the API call will fail.

Represents a partitioned cookie's partition key.

• hasCrossSiteAncestor

  boolean optional

  Indicates if the cookie was set in a cross-cross site context. This prevents a top-level site embedded in a cross-site context from accessing cookies set by the top-level site in a same-site context.

• topLevelSite

  string optional

  The top-level site the partitioned cookie is available in.

Represents a cookie store in the browser. An incognito mode window, for instance, uses a separate cookie store from a non-incognito window.

• The unique identifier for the cookie store.

• Identifiers of all the browser tabs that share this cookie store.

Details to identify the frame.

• documentId

  string optional

  The unique identifier for the document. If the frameId and/or tabId are provided they will be validated to match the document found by provided document ID.

• The unique identifier for the frame within the tab.

• The unique identifier for the tab containing the frame.

The underlying reason behind the cookie's change. If a cookie was inserted, or removed via an explicit call to "chrome.cookies.remove", "cause" will be "explicit". If a cookie was automatically removed due to expiry, "cause" will be "expired". If a cookie was removed due to being overwritten with an already-expired expiration date, "cause" will be set to "expired_overwrite". If a cookie was automatically removed due to garbage collection, "cause" will be "evicted". If a cookie was automatically removed due to a "set" call that overwrote it, "cause" will be "overwrite". Plan your response accordingly.

"evicted"

A cookie's 'SameSite' state (https://tools.ietf.org/html/draft-west-first-party-cookies). 'no_restriction' corresponds to a cookie set with 'SameSite=None', 'lax' to 'SameSite=Lax', and 'strict' to 'SameSite=Strict'. 'unspecified' corresponds to a cookie set without the SameSite attribute.

"no_restriction"

chrome.cookies.get(
  details: CookieDetails,
): Promise<Cookie | undefined>

Retrieves information about a single cookie. If more than one cookie of the same name exists for the given URL, the one with the longest path will be returned. For cookies with the same path length, the cookie with the earliest creation time will be returned.

chrome.cookies.getAll(
  details: object,
): Promise<Cookie[]>

Retrieves all cookies from a single cookie store that match the given information. The cookies returned will be sorted, with those with the longest path first. If multiple cookies have the same path length, those with the earliest creation time will be first. This method only retrieves cookies for domains that the extension has host permissions to.

• Information to filter the cookies being retrieved.

  • Restricts the retrieved cookies to those whose domains match or are subdomains of this one.

  • Filters the cookies by name.

  • The partition key for reading or modifying cookies with the Partitioned attribute.

  • Restricts the retrieved cookies to those whose path exactly matches this string.

  • Filters the cookies by their Secure property.

  • Filters out session vs. persistent cookies.

  • The cookie store to retrieve cookies from. If omitted, the current execution context's cookie store will be used.

  • Restricts the retrieved cookies to those that would match the given URL.

chrome.cookies.getAllCookieStores(): Promise<CookieStore[]>

Lists all existing cookie stores.

chrome.cookies.getPartitionKey(
  details: FrameDetails,
): Promise<object>

The partition key for the frame indicated.

chrome.cookies.remove(
  details: CookieDetails,
): Promise<object | undefined>

Deletes a cookie by name.

• Promise<object | undefined>

chrome.cookies.set(
  details: object,
): Promise<Cookie | undefined>

Sets a cookie with the given cookie data; may overwrite equivalent cookies if they exist.

• Details about the cookie being set.

  • The domain of the cookie. If omitted, the cookie becomes a host-only cookie.

  • expirationDate

    number optional

    The expiration date of the cookie as the number of seconds since the UNIX epoch. If omitted, the cookie becomes a session cookie.

  • httpOnly

    boolean optional

    Whether the cookie should be marked as HttpOnly. Defaults to false.

  • The name of the cookie. Empty by default if omitted.

  • The partition key for reading or modifying cookies with the Partitioned attribute.

  • The path of the cookie. Defaults to the path portion of the url parameter.

  • The cookie's same-site status. Defaults to "unspecified", i.e., if omitted, the cookie is set without specifying a SameSite attribute.

  • Whether the cookie should be marked as Secure. Defaults to false.

  • The ID of the cookie store in which to set the cookie. By default, the cookie is set in the current execution context's cookie store.

  • The request-URI to associate with the setting of the cookie. This value can affect the default domain and path values of the created cookie. If host permissions for this URL are not specified in the manifest file, the API call will fail.

  • The value of the cookie. Empty by default if omitted.

chrome.cookies.onChanged.addListener(
  callback: function,
)

Fired when a cookie is set or removed. As a special case, note that updating a cookie's properties is implemented as a two step process: the cookie to be updated is first removed entirely, generating a notification with "cause" of "overwrite" . Afterwards, a new cookie is written with the updated values, generating a second notification with "cause" "explicit".

• The callback parameter looks like:

  (changeInfo: object) => void

  • • The underlying reason behind the cookie's change.

    • Information about the cookie that was set or removed.

    • True if a cookie was removed.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-11 UTC.

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