Executing javascript in the Address Bar in order to get & run a cookie's value

Question

Let's say that I got a cookie just from browsing a website(which I do not own), and I know the cookie's name. Now let's say I am on that website, going over to the address bar. My question is: Would I be able to display the value of that cookie after entering some sort of Javascript Code? or Any other code?

It's kinda Important for me to learn right now as I am studying websites. (And I know that I can get the cookies value with "Cookie Editor" and etc. I am just trying to get it through the address bar too).

Answer 1

javascript:alert(document.cookie); in Chrome's address bar works fine for me (it'll list all cookies for the current document). Note that for security reasons you have to type, not paste, the javascript: part.

Answer 2

Most browsers can just show you the value of cookies for all sites you've visited (including the current one). So, it's probably just easier to examine the cookie values there. I know Firefox has a full built-in UI for displaying all the cookies for a given domain. I suspect Chrome does too, but I'll have to look for that now to see if I can find it.

In Chrome, you go to:

Settings
Show Advanced Settings
Privacy/Content Settings...
All Cookies and Site Data...
Click on a Domain
Click on a cookie name
See the value for that cookie name

Answer 3

Other than using the address bar you might want to look at the JavaScript console (CTRL+SHIFT+J for PC, I'm not sure about Apple). You can write JavaScript expressions there without having to use window.alert() etc.