Error when attempting to parse xhr response text (Unexpected token < in JSON at position 0)

Question

I am using FineUpload plugin for Uploading file. I am able to see while rendering page But I am getting error message Error when attempting to parse xhr response text (Unexpected token < in JSON at position 0). Due server is not returning valid JSON data that's why I am getting this Error. But I don't want to save my file on server side so dint written any code on server side. I just want to show that file on browser.

How I can achieve same.

Script:

<link type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/file-uploader/5.16.2/fine-uploader-gallery.min.css" rel="stylesheet">


<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/file-uploader/5.16.2/fine-uploader.min.js"></script>

<script>
        var galleryUploader = new qq.FineUploader({
            element: document.getElementById("fine-uploader-gallery"),
            template: 'qq-template-gallery',
            //request: {
            //    endpoint: '/server/uploads'
            //},
            
            validation: {
                allowedExtensions: ['jpeg', 'jpg', 'gif', 'png']
            }
        });
    </script>

Console window