Alamofire how to parse JSON in Swift?

I used Alamofire's GET function to return this JSON from API.
Here's how I used Alamofire:

struct Params: Encodable {
            let code: String
            let codeType: String
        }

        let params = Params(code: "709532929804933", codeType: "IDENTCODE")
        let headers: HTTPHeaders = [
            "Authorization": "Basic xxxHIDExxx",
            "Accept": "application/json"
        ]
        
        AF.request("https://xxx.xx/cloudcrm/customer",
                   method: .get,
                   parameters: params,
                   headers: headers).validate(statusCode: 200..<300).responseJSON { response in
                    switch response.result {
                            case .success:
                                debugPrint(response.value as Any)
                         
                    case let .failure(error): 
                                print(error)
                            }
                   }

        
Print json:
{
    customerData = "<zakaznik><zkznid>475301</zkznid><titul></titul><jmeno>757B746D</jmeno><prijmeni>D\U00c1RKOV\U00c1 KARTA</prijmeni><rozliseni></rozliseni><osloveniok>false</osloveniok><kontos></kontos><skupzak1_klic>DK</skupzak1_klic><skupzak2_klic>default</skupzak2_klic><cenkat_klic>1</cenkat_klic><platido>2118-07-31</platido><valid>true</valid></zakaznik>";
    message = "Informace o z\U00e1kazn\U00edkovi \"D\U00c1RKOV\U00c1 KARTA 757B746D\" na\U010dteny.";
}

I tried to see if the JSON is valid (https://jsonlint.com/), but it's not.
Is there any way to parse this string in Swift?

It's JSON.<br>
It has already been parsed and response.value is a Dictionary, a [String: Any], and in your sample case, even a [String: String].<br>
What you printed is the description of a NSDictionary (more or less a Swift Dictionary), and the output is in OpenStep Format.
Notice the: "=" between key & value, and the ";" at the end of the line.
What tells me that's also JSON? You printed it in the success case, so it succeed parsing the Data into "JSON" object.

If you want to see the actual "JSON" data you received:

let responseStr = String(data: response.data!, encoding: .utf8)
print("Received: \(responseStr)")

You should see it's valid JSON.

Now, responseJSON is deprecated, please use Codable and responseDecodable(of:).

If you still don't want to use Codable:

if let dict = response.value as? [String: Any] {
    if let customerData = dict["customerData"] as? String {
        print("customerData: \(customerData)")
        //Parse the XML
    }
    if let message = dict["message"] as? String {
        print("message: \(message)")
    }
}