I recently learned socket.io and I made a simple app with it, and then published it on a heroku app.

They say you should write this code in your html document for socket.io:

<script>
$(document).ready(function () {
const socket = io();
$('form').submit((e) => {

e.preventDefault();
socket.emit('chat message', $('#m').val());

$('#m').val('');

return false;

});
socket.on('chat message', (msg) => {

$('#messages').append(&lt;li&gt;Message: ${msg}&lt;/li&gt;);

});

});

This is from socket.io’s documentation page.

But I can’t figure out how I connect to my heroku app were my socket.io’s index.js lies so my html document can read the emitted events.