Answers for "reference javascript code in html"

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

sudo lsof -i :3000

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

//Run this command to get the PID of the running 
ps aux | grep node
//Then kill/stop it by 
kill -9 PID

import js in html

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

how to add script in html head

<script src="script.js" defer></script>

<!--just add defer attribute so script will execute at last-->