Question

chrome.cookies.get({url:"http://www.dahotre.com", name:"userid"}, function(){}) shows undefined in the console.

If I skip the optional empty function(), it throws an error.
chrome.cookies.get({url:"http://www.dahotre.com", name:"userid"}) shows Uncaught Error: Parameter 2 is required.

And if I use function(Cookie c){} as the second param, it throws SyntaxError: Unexpected identifier

Following is the permissions line from my manifest.json:

"permissions": [ "cookies", "http://www.dahotre.com/"],

When I inspect the cookies in my browser, I can most certainly find a cookie from the site www.dahotre.com with a name=userid and a integer content.

How to access this cookie in a chrome extension?

Answer 1

Try:

chrome.cookies.get({url:"http://www.dahotre.com", name:"userid"}, function(cookies){
    console.log(cookies);
});

Your function(Cookie c){} was a nice try, but JavaScript is dynamically typed language and those verbose types are used only for documentantion purpose.