JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" name="option1" value="checkbox1"> Checkbox1
<input type="checkbox" name="option2" value="checkbox2" checked> Checkbox2

JavaScript

var	checkboxElements = document.getElementsByTagName("input");
        var issomethingchecked = false;

        for(var i = 0; i < checkboxElements.length; i++) {
        
        if(checkboxElements[i].type.toLowerCase() == 'checkbox') {

            if (checkboxElements[i].checked == true) {
                issomethingchecked = true;
            }
    
        }
            
            if (issomethingchecked === true) {
                // if at least one checbox is checked continue with submiting 
                  console.log(issomethingchecked);
            }
}