Tinymce 4.9.8 upload image

Code:

xhr.open('POST', '<?= base_url('admin/blog/imgUpload') ?>');

// change to
xhr.open('POST', "<?= base_url('admin/blog/imgUpload') ?>");

Thank you for reply, still not working. Chrome console show error

Code:

Uncaught SyntaxError: Unexpected token < in JSON at position 43
    at JSON.parse (<anonymous>)
    at XMLHttpRequest.xhr.onload

This is me. JK not me.