Answers for "how to terll html a file is a js file"

kill all ports mac

lsof -n -i TCP:8080
COMMAND   PID   USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
node     54762   user   23u  IPv4 XXXXXXXXX      0t0  TCP 127.0.0.1:http-alt (LISTEN)
PID // is second field in the response . Then, kill that process:

kill -9 54762 // here put PID number found on the table 54762

killing a port mac

kill -9 <PID>

how to link javascript to html

<script src="PathToYourFile.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-->