Accessing/modifying HTTP cookies with JavaScript is possible through the
Browser access/management of cookies is specified by the RFC 2109 spec which states:
Retrieving cookie values is easy enough through the interface, simply go to www.nytimes.com, open a console and then enter
Why is this problematic? Lets walk through an example, albeit a trivial one, to illuminate this issue. Starting with two cookies:
If the document location is 'www.nytimes.com', then the returned cookies will be:
The two cookies while sharing the same name have a different subdomain. Since the domain wasn't specified in the assignment, it defaulted to the host domain ('www.nytimes.com') in the example. So in order to update an existing cookie the same domain and path originally assigned to the cookie must be used. However no meta data is returned via
Assuming for some reason it was desirable to have two cookies with the same name but a different subdomain and/or path, how do you know which cookie is what? Since
document.cookie
interface which permits two operations: retrieving all of the cookies that are accessible from the current document domain and path; and setting/updating an individual cookie. This interface is limited and can cause unexpected behavior if used without a thorough understanding of the interface and the W3C spec for HTTP cookies.Browser access/management of cookies is specified by the RFC 2109 spec which states:
- Cookie uniqueness is controlled by the combination of the cookie's name, domain, and path.
- When setting a cookie with a specified domain, it must begin with a dot (.jasoncust.com).
- The domain will default to the host domain's location (www.jasoncust.com).
- The path will default to host domain's path up to but not including the right most '/'.
- Cookie access is restricted to the cookie path being a prefix of the document's full path (since paths were originally directory structures, cookies were accessible only from subdirectories).
- Similarly, cookie access is restricted to the cookie domain being a suffix of the document's domain. Note this is only true for cookie domains starting with the required dot (.jasoncust.com). If a cookie domain was set by default to say 'jasoncust.com', the cookie would not be accessible from any subdomains.
Retrieving cookie values is easy enough through the interface, simply go to www.nytimes.com, open a console and then enter
document.cookie
to see a string containing all of the cookies accessible from the current host domain and path. It will look something like:> document.cookie "RMID=0734175263b54f0d07f7801a; adxcs=s*2b53d=0:1; adxcl=t*2b53d=4f32014f:1326254071|ti=4f32014f:1326254071"The format of the returned string is
name=value
with multiple cookies joined by a semicolon + space ('; '
). So in order to get a particular cookie's value, a bit of parsing is required. One major caveat is only the cookie's value is returned. The cookie's path, domain, secure setting, and the expiration/max-age are not returned through the interface which can be problematic.Why is this problematic? Lets walk through an example, albeit a trivial one, to illuminate this issue. Starting with two cookies:
name | value | domain | path |
---|---|---|---|
uuid | 19691231 | .nytimes.com | / |
xid | 42 | .nytimes.com | / |
If the document location is 'www.nytimes.com', then the returned cookies will be:
> document.cookie "uuid=19691231; xid=42"To set or update a cookie a string representing the cookie is assigned to
document.cookie
. For example, to update the 'xid' cookie to 'lorum', a first approach might look like:> document.cookie = "xid=lorum";Checking the cookie value returns:
> document.cookie "uuid=19691231; xid=42; xid=lorum"What happened? There are now two cookies with the name 'xid'. Looking at the table again we see why this happened:
name | value | domain | path |
---|---|---|---|
uuid | 19691231 | .nytimes.com | / |
xid | 42 | .nytimes.com | / |
xid | lorum | www.nytimes.com | / |
The two cookies while sharing the same name have a different subdomain. Since the domain wasn't specified in the assignment, it defaulted to the host domain ('www.nytimes.com') in the example. So in order to update an existing cookie the same domain and path originally assigned to the cookie must be used. However no meta data is returned via
document.cookie
. This means any cookies that are to be manipulated by JavaScript need to have a set domain and path (probably the root domain and path) that both the server and the JavaScript code use when setting cookies. This also applies to any optional cookie settings such as the expiration and the secure flag.Assuming for some reason it was desirable to have two cookies with the same name but a different subdomain and/or path, how do you know which cookie is what? Since
document.cookies
does not return the domain or path of the cookies, there is no way to tell. This may seem trivial, but what if an operation needed to clear or overwrite the 'xid' cookie with the value 'lorum'? How would it do so?tl;dr
When using thedocument.cookie
interface, the lack of any meta data about the cookies returned can cause issues if not properly designed around. Two key points to remember are:- Cookies with the same name but different subdomains and/or paths are allowed but this meta information is not returned by the interface. So there is no way to tell which cookie value is for what domain/path.
- When updating a cookie, the original cookie is replaced if the name/domain/path match. If they don't match, a new cookie with the same name but different domain/path will be created. Also, when replacing a cookie, any other meta data is overwritten even if not explicitly stated.
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