Troubleshooting: How to open the Developer Console
To open the developer console in Google Chrome, open the Chrome Menu in the upper-right-hand corner of the browser window and select More Tools > Developer Tools.
You can also use the shortcut Option + ⌘ + J (on macOS), or Shift + CTRL + J (on Windows/Linux).
The console will either open up within your existing Chrome window, or in a new window. You may have to select the Console tab.