Debugging JavaScript in Chromium Embedded Framework

You may also use ShowDevTools() extension method (source)

ChromiumWebBrowser browser = new ChromiumWebBrowser();
browser.ShowDevTools(); // Opens Chrome Developer tools window

Enable remote debugging in your application:

C# (CefSharp)

CefSettings.RemoteDebuggingPort = 8088;

C++

CefSettings settings;
settings.remote_debugging_port = 8088;

then run your app and point your browser to http://localhost:8088/ to access the Chromium developer console (the same you have in Chrome with Ctrl+Shift+j)