Tizen Developers

The some procedure like on emulator you need to connect your device to the pc and can check it via Log-Tab in the SDK.

To filter for console-messages, use "ConsoleMessage" as Tag on the Log-Tab and dont forget to setup the Debug-Levels on the same tab. (you should use V,D,E)

Did activate the Debug-Mode on your Gear S3? 

Settings -> Gear info -> Debugging

I'm also interested in an solution. When running a application in Debug Mode on emulator it works but not on physical devices.

If you can use "Debug as" then web inspector will be launched. In the console tab, you can fine the console log.

I have the same problem. On emulator, the console.log (error, debug etc.) output works but not on real device (Gear S3).

It's very annoying. Did anyone find out how to fix this?

To debug Tizen web application,Google Chrome is mandatory .... console.log() will write logs on Chrome console if you select 'Run as Debug' mode your project ... 

Thank you Andre for your answer.

Meanwhile, I've made some progress on this. I found out that the logs don't appear when I use them in a watch face. The debugger (Chrome) doesn't connect because the watch face is not launched after the deploy on a real device. Not sure if it's possible to attach the debugger when the watch face starts but as a workaround I removed the ".../category/wearable_clock" (only for debugging purposes) from category and the watch face is launched as an app and the debugger connects and works fine.