JSFiddle - React, Tailwind, and code Playground

HTML

Title : <input type="text" id="title"><br/>
Keyword : <input type="text" id="keyword">

JavaScript

$('#title').keyup(function() {
    var replaceSpace = $(this).val(); 

   
        var result = replaceSpace.replace(" ", ";");
        
        $("#keyword").val(result);
 
    
});