Getting error: Uncaught SyntaxError: JSON.parse: unexpected character at line 3 column 1 of the JSON data - In this almost valid code

For the following code getting output

$response=array();
    
$response['wheel_deg_end'] = (360*(ceil($wheel->wheel_spin_time/3))) + (360 - (($wheel_slice_number * 30) - 30)) + rand(-5,5);
$response['wheel_time_end'] = $wheel->wheel_spin_time * 1000;
$response['success'] = true;
                    
$ab = json_encode($response,JSON_NUMERIC_CHECK);
echo $ab;

Output:

"{"wheel_deg_end":1743,"wheel_time_end":10000,"success":true}"

and error in Json parse:

jQuery.ajax({
    url: couponspining_ajaxurl,
    type: 'POST',
    data: {
        action: 'couponspining_wheel_run',
        form_data: form_data,
        preview_key: this.preview_key
    },
    context: this,
}).done(function(json){
    this.submit_form_done(jQuery.parseJSON(json));
});

Uncaught SyntaxError: JSON.parse: unexpected character at line 3 column 1 of the JSON data submit_form http://localhost/shopify-php-app/src/public/assets/js/couponspining1.js:210

from Getting error: Uncaught SyntaxError: JSON.parse: unexpected character at line 3 column 1 of the JSON data - In this almost valid code