You can do it using serialize()
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("div").text($("form").serialize());
});
});
</script>
</head>
<body>
<form action="">
First name: <input type="text" name="FirstName" value="Mickey"><br>
Password: <input type="text" name="LastName" value="Mouse"><br>
</form>
<button>Serialize form values</button>
body>
<form action="">
First name: <input type="text" name="nm" value="Mickey"><br>
Last name: <input type="password" name="password" value="Mouse"><br>
</form>
<button>Serialize form values</button>
<div></div>
</body>
</html>
<div></div>
</body>
</html>
Hope this will help you