For debugging purposes, is it possible to access userscript variables from the console in Google Chrome?
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3 Answers
Suppose you had a Chrome userscript with this code:
var userscriptVar = "I'm a global variable, userscript context.";
window.var2 = "I'm a window.scope variable, userscript context.";
console.log ("Hello from the userscript.");
To access these userscript variables:
Determine the userscript's ID. You can see it on the extensions page (
chrome://extensions/):
Switch to the script's context by clicking on the context menu at the bottom of the console:
Note that the id (
pfnbaeafniclcjhfkndoploalomdmgkc) is the same as that listed on the extensions page.Now you will immediately be able to see and change the window-scoped variable (
var2), but you can't see the userscript's global (userscriptVar) because the script-instance has long since finished and disappeared. :
To access and change userscript variables, while the script is still active, set a breakpoint in the script and use the debugger. See this answer for how to do that.
With the userscript paused at a suitable breakpoint, you can see, but not change the global values, from the console.
But you can change the value from the debugger:
1 Comment
Kugel
Changed my answer because this is so detailed a 5yo could understand ;-)
hum yes. Just type the var name and hit enter to evaluate (use dir(xxx) for objects)
NB: var must be globalset on unsafeWindow
2 Comments
Kugel
Does not work. Probably because each userscript is embeded in annonymous function.
What worked for me is I made the variable global. i.e
var x = "Chairman Mao"; // x not accessible to chrome
x = "Chairman Mao"; // X becomes accessible to chrome via inspector
