Answers for "how to import a js file in html file"

Error: listen EADDRINUSE: address already in use :::3000

sudo lsof -i :3000

EADDRINUSE: address already in use

sudo lsof -i :<PORT>
kill -9 <PID>

EADDRINUSE: address already in use :::5000

kill -9 {PID}

include script in html

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