JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="fillingInput"/>
<input type="text" id="filledInput" maxlength="5"/>
<input type="button" id="add"/>

JavaScript

$('#add').click(function(){
   var str=$('#fillingInput').val();
   if(str.length > 5) {
      str = str.substring(0,5);
    
  }
$('#filledInput').val(str);
 });