Pulling values from inner curly brackets

Question

I am trying to pull the values from a JSON response and have managed to get most of the values except the one I need which is nested in an inner set of curly brackets

public class web_ser {

@future(callout=true)
public static void web_services_rest(String order_JSON){

    String payload_JSON =  order_JSON;
    String endpoint = 'https://some_website.com';

    HttpRequest request = new HttpRequest();
    Http http = new Http();

    request.setEndpoint(endpoint);
    request.setMethod('POST');
    request.setBody(payload_JSON);

    HttpResponse response = http.send(request);

    System.debug(response.toString());
    System.debug('STATUS: ' + response.getStatus());
    System.debug('STATUS_CODE: ' + response.getStatusCode());

    String responseJSON = response.getBody();
    System.debug('responseJSON: ' + responseJSON);

    Map<String, Object> deserialized_JSON_response = 
        (Map<String, Object>)JSON.deserializeUntyped(responseJSON);

    Object message = deserialized_response.get('message');
    System.debug('message: ' + message);
}}

The output from message looks something like this:

responseJSON: {"status": "100", "code": "success", "message": "{order_number:00001979,id_number:I-00000982-10}"}

The information I'm trying to pull, id_number, is in the message portion of the deserialized JSON packet:

"message": "{order_number:00001979,id_number:I-00000982-10}"

I am able to to put message into a variable but have been unable to extract the value for the key id_number. What am I missing to be able to access id_number?

Answer 1

Because the interior value(s) of message is not JSON:

"message": "{order_number:00001979,id_number:I-00000982-10}"

you'll need to use string class methods as in:

String IdNumber = messageVbl.substringBetween('id_number:','}');