JSFiddle - React, Tailwind, and code Playground

by NickU

HTML

<input type="text" id="i" class="input_field" name="i">
            <input type="text" id="o" class="input_field" name="o">

JavaScript

let tog = true;
    
    $("#i").keyup(function() {
    $("#o").val(
        $("#i").val().replace(/(\.[0-9]*[1-9])0+$|\.0*$/,'$1')
        );
    });