如何在AJAX中解析数据

Would like to ask for a help regarding on ajax's success part. I tried to log it on the console but there is this kind of error

Uncaught SyntaxError: Unexpected number in JSON at position 4
    at JSON.parse (<anonymous>)
    at Function.parseJSON (jquery.min.js:4)
    at Object.success (cta:378)
    at c (jquery.min.js:4)
    at Object.fireWith [as resolveWith] (jquery.min.js:4)
    at k (jquery.min.js:6)
    at XMLHttpRequest.r (jquery.min.js:6)

Maybe there's something I didn't understand on my code. Here is my code

<script>
    $(document).ready(function() {
        $(".submit").click(function() {    
            var emailval = $("#email").val().trim();
            
            $.ajax({
                url: '/test.php',
                type: 'POST',
                dataType: 'json',
                data: 'email='+emailval,
                success: function(data) {   
                    var result = $.parseJSON(data);
                    console.log(result);
                }
            });
        });
    });
</script> 

I wanted to get the value of the email and transfer it to my PHP file. Please help

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