code works without error on localhost, but giving SyntaxError: JSON.parse: unexpected character at l-CodePudding

i am working on an python GUI application, and this part is back end of it. i am really unknown to JSON. and familiar with little bit of PHP. if possible, please give me the exact line of code where should i change it.

code giving SyntaxError: JSON.parse: unexpected character at line 2 column 1 of the JSON data my local php version is v 8.1.12 is this a problem? ?

<?php 
    header('Content-type: application/json');
    // Include database connector
    include 'database_connector.php';
    
    // test connection
    if (isset($_POST['test_connection'])) {
        $data['connection_response'] = "OK";
    }

    // check app key and id
    if (isset($_POST['checkapp'])) {
        $data['valid_app'] = False;
        if (!isset($_POST['app_key']) or empty($_POST['app_key'])) {
            $data['response_message'] = "Invalid app key";
        }elseif (!isset($_POST['app_id']) or empty($_POST['app_id'])) {
            $data['response_message'] = "Invalid app id";
        }else{
            if (checkAppKey($_POST['app_id'], $_POST['app_key'])) {
                if (checkAppKeyExpiration($_POST['app_key'])) {
                    $data['response_message'] = "App key expired! Please login";
                }else{
                    $data['response_message'] = "Valid app key and id";
                    $data['valid_app'] = True;
                    $userDetails = getAppUser($_POST['app_id']);
                    if(!empty($userDetails) && isset($userDetails['user_name'])){
                        $data['username'] = $userDetails['user_name'];
                    }else{
                        $data['username'] = "";
                    }

                    $appDetails = getAppDetails($_POST['app_id']);
                    if(!empty($appDetails) && isset($appDetails['key_expiration_date'])){
                        $data['expiry_date'] = $appDetails['key_expiration_date'];
                    }else{
                        $data['expiry_date'] = "unknown";
                    }
                }
            }else{
                $data['response_message'] = "Invalid app id or key";
            }
        }

        $data['app_id'] = $_POST['app_id'];
        $data['app_key'] = $_POST['app_key'];
    }

    
    // view if app key already exists
    function view_app_key($link)
    {
        global $dbh;
        $sql = "SELECT * FROM `applications` WHERE `application_key`='".$link."'";
        $query = $dbh->prepare($sql); 
        $query->execute(); 
        $result = $query;
        if ($row = $result->fetch( PDO::FETCH_ASSOC )){
            return "true";
        }else{
            return "false";
        }

    }

    echo json_encode($data);
?>

the full code is here: https://drive.google.com/file/d/1Q5qLAZW5qachxWuc4ibtDMCH5KochjuS/view

CodePudding user response：

In your ajax call try this Simply change,

var respons = jQuery.parseJSON(response);

var respons = response;

Explanation: If the configuration of your AJAX call is having dataType: json you'll get a JavaScript object so it's no longer necessary to use JSON.parse().