JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id='txtArea' rows=15></textarea>

JavaScript

$('#txtArea').keydown(function(e) { 

    if (e.which == 8)
    {
     var value =   $(this).val();
     var lastchar = value.substring(value.length - 1);
     
        alert("Last character is: " + lastchar);
        $(this).val(value.substring(0, value.length - 1));
        e.preventDefault();
    }
    
});