How to catch JS error in Android Browser?

Question

Android

There is an admin panel that works perfectly on the desktop: IE10+ and all modern browsers.
Nothing special: React + Redux with some goodies.
It also works great in mobile chrome.
But it completely refuses to work in the standard Adnroid Browser.
Arc phone (something there), Android 5.1.
After loading JS, as if it doesn't work. No errors, no response.
I installed Firebug Lite, I thought maybe the error console will show - it's empty.
How it is possible to debug this miracle? To mob. you can connect a computer to chrome, but to this ... can you?

Answer 1

window.onerror = function(e) {
  alert(e.message, e.filename, e.lineno)
}

Answer 2

try

webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
        android.util.Log.d("WebView", consoleMessage.message());
        return true;
    }
});