Answers for "run javascript from html src"

mac terminal find process by port

sudo lsof -i tcp:3000

killing a port mac

kill -9 <PID>

script src tag in html

<script type="text/javascript" 
         src="file.js">  
</script>

how to link js to html

<script src="Your-JavaScript-File.js"></script> <!--If JS file is in same folder with HTML file-->