How to log in js rules?

my goal is to read incoming(some protocol) data split , change , and send to few channels to see what is going on with bus in this protocol
I wish to see what i am taking from bus before it splits and goes next step , soo I need good logging with Chrome logs will be best but i see there is nothing soo meaning JS not working ?
Or I should do many manipulations to see only log ?
Where should I open log panel?

OpenHAB’s rules run server side, you’ll see the output if the log statements in your openhab.log file on your OH server. On an apt installation this is found in /var/log/openhab/openhab.log.

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