JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" id="selectAll" value="selectAll"> Select / Deselect All<br/><br/>

<input type="checkbox" name="foo" value="bar1"> Bar 1<br/>
<input type="checkbox" name="foo" value="bar2"> Bar 2<br/>
<input type="checkbox" name="foo" value="bar3"> Bar 3<br/>
<input type="checkbox" name="foo" value="bar4"> Bar 4<br/>

JavaScript

$('#selectAll').click(function() {
   if(this.checked) {
       $(':checkbox').each(function() {
           this.checked = true;                        
       });
   } else {
      $(':checkbox').each(function() {
           this.checked = false;                        
       });
   } 
});