JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="booter" />
<input type="text" id="text" />

JavaScript

$("#booter").keypress(function(e){
     var code = e.charCode || e.keyCode;
     var input = $(this).val() + String.fromCharCode(code);
     $('#text').focus().val(input);
     return false;
});