JSFiddle - React, Tailwind, and code Playground

HTML

<form method="post" id="opretMedlem" enctype="multipart/form-data">
    <input type="text" name="info[name]" class="form-control1 info" />
    <input type="text" name="info[age]" class="form-control1 info" />
    <input type="file" name="info[image]" class="form-control1 info" />
    <input type="submit" name="submit" class="btn btn-info" value="Create member" />
</form>

JavaScript

$('#opretMedlem').on('submit', function(event){
    event.preventDefault();

    var form_data = $(this).serialize();
    
    var form = $(this)[0];
		var data = new FormData(form);

    $.ajax({
        url:"scripts/createMember.php",
        enctype: 'multipart/form-data',
        method:"POST",
        data:data,
        cache: false,
        contentType: false,
        processData: false,
        success:function(data) {
          alert('done');
        }
   });
});