I am building my own tool based on html and javascript and i shall integrate live market ltp data into it. I created websocket and live data keep coming. However it is coming in bytes format and i shall convert it to readable message format and use it.
A third party app can't display our market data. You can write to compliance and check with them before starting the project. You can reach out to compliance team on kiteconnect(at)zerodha.com