JSFiddle - React, Tailwind, and code Playground

HTML

<form id="form">
    <input type="text" class="formatted-number-input" value="12.434234234" />
</form>

JavaScript

$(".formatted-number-input").each(function() {
   var value = $(this).val(); 
   console.log("value",value)
   $(this).data("originalValue", value);
   var roundedValue = parseFloat(value).toFixed(2);
   $(this).val(roundedValue);
});

$("#form").submit(function() {    
    var formattedInput = $(".formatted-number-input");
    formattedInput.each(function() {
        var originalValue = $(this).data("originalValue");
        $(this).val(originalValue);
        console.log("$;",$(this).val(originalValue))
    });
});