Access cookies from Google Chrome extension

Question

Is there any way to access cookies from Chrome extension? this code

document.cookie.length

always returns - 0.

5

do you want to steal cookies? – Peter Sep 20 '09 at 14:02

score 37 · Answer 1 · answered May 30 '13 at 17:14

37

Currently the best (the simplest) way to get site cookies in extension is like this:

chrome.cookies.get({ url: 'http://example.com', name: 'somename' },
  function (cookie) {
    if (cookie) {
      console.log(cookie.value);
    }
    else {
      console.log('Can\'t get cookie! Check the name!');
    }
});

So now you don't need content script for this but don't forget to include permissions into manifest:

"permissions": [
  "cookies",
  "*://*.example.com/*"
]

answered May 30 '13 at 17:14

Konstantin Smolyanin

16,105
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14

This worked for me. It is worth mentioning that you need to put this code on the background script. – Clint Eastwood Feb 04 '15 at 17:48

score 32 · Answer 2 · edited Dec 21 '09 at 14:32

32

It's the first time I read something really wrong on this site. Getting actual document cookies from an extension is INDEED possible.

you just need these two things in your manifest:

"content_scripts": [
    {
      "matches": ["http://*/*", "https://*/*"],
      "js": ["cookie_handler.js"]
    }
  ],
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],

your cookie_handler.js will be executed in the same context of every loader page/frame/iframe. try to put there a single line:

alert(document.cookie);

and you will see :)

edited Dec 21 '09 at 14:32

Brian Campbell

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answered Dec 21 '09 at 14:14

Zibri

8,006
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40

Does this mean that it is possible to make an extension like Permit Cookies from Firefox? That extension allows the user for each site to Allow always, Allow for session, Block, Remove. Or can such an extension not be made for Chrome? – Louise Dec 22 '09 at 05:12
it gives error: `cannot load javascript cookie_handler.js for content_scripts` – Muhammad Adeel Zahid Apr 06 '12 at 13:22
4

@MuhammadAdeelZahid You need to write your cookie handler script there :P – Prashant Singh Feb 01 '13 at 07:32

score 3 · Answer 3 · answered Jun 07 '10 at 20:47

If you're looking to manipulate cookie information without the user having to visit the site, (useful for something like FireFox's TACO), you're currently out of luck. Looks like Google's working on it though: they recently added a relatively complete cookie handler to the experimental API: chrome.experimental.cookies

Hopefully this will graduate to supported API soon.

score 0 · Answer 4 · answered Oct 28 '21 at 00:12

If you change manifest.json you have to delete the google chrome extension and add it again.

Try these steps:

Click Extensions at the top of your Chrome browser -> Manage Extensions.
Remove the Extension
Click Load Unpacked -> Navigate to extension project folder.

The changes to manifest.json have been loaded.

score -5 · Answer 5 · answered Nov 24 '09 at 18:24

-5

Even better, you can use the HTML5 Localstorage:

localStorage.setItem("itemid", "hello" );   // write
value = localStorage.getItem("itemid");     // read

If you really wanted to read the cookies of any site the user is watching, as Dan wrote, it is not possible, as really bad things could be done.

All you can get from a page is the page DOM content.

answered Nov 24 '09 at 18:24

Omiod

10,754
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Now we should use `chrome.storage.local`. Anyway it's an 5-years-ago anwser. – jiyinyiyong Apr 04 '14 at 05:50

Access cookies from Google Chrome extension

5 Answers5

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