How can we decode (nodejs) flows?

I would like to capture and decode based messaging between nodeJS server and web browser.

Although I can see the post and get flows on mitmproxy; I see nothing related with the parameters / messages in the flow details…

Is it related with my lack of experience or mitmproxy cannot decode the actual messages within

We currently don’t support displaying websocket flows.
But you can see the messages in the event log, on git-master.
Change log verbosity to “debug” if you want to see complete messages. E for event log.