Open remote debugging mode in an already open chrome browser

Question

I am trying to open "remote debugging mode" in an already running chrome browser.

Here is the command I am executing:
chrome.exe --remote-debugging-port=9222 --user-data-dir="C:\Users\Ideal\AppData\Local\Google\Chrome\User Data"

But when I visit http://127.0.0.1:9222/json/version, nothing shows up.

However, if I close the browser and then run the same process, then http://127.0.0.1:9222/json/version works great.

So how can I open remote debugging mode in an already running Chrome browser?

Answer 1

Opening remote debugging mode in an already running Chrome browser is not directly supported by default, as the --remote-debugging-port flag is typically used to enable remote debugging during Chrome's startup. Once Chrome is running, changing this flag will not take effect.

You can try creating a new user profile on the fly and then use that profile to run Chrome with remote debugging enabled

xcopy "%LOCALAPPDATA%\Google\Chrome\User Data\Default" C:\TempProfile /E /I /H /C /K /O /X

"C:\Program Files\Google\Chrome\Application\chrome.exe" --remote-debugging-port=9222 --user-data-dir="C:\TempProfile"