Requirement:

Developer is consuming an external REST web-service in D365/X++ . Response is in the JSON format.  Developer needs to DeSerialize incoming JSON so that values can be used later in the system.

Sample Code:

1. Create a contract class

   [DataContract]
   class JSONContract
   {
       String50 parmFirst, parmSecond;
       [
           DataMemberAttribute('parmFirst')
       ]
       public String50 parmFirst(String50 _parmFirst = parmFirst)
       {
           parmFirst = _parmFirst;
           return parmFirst;
       }
       [
           DataMemberAttribute('parmSecond')
       ]
       public String50 parmSecond(String50 _parmSecond = parmSecond)
       {
           parmSecond = _parmSecond;
           return parmSecond;
       }
   }

2. Sample Class

   class RunnableClassABC
   {
       /// <summary>
       /// Runs the class with the specified arguments.
       /// </summary>
       /// <param name = "_args">The specified arguments.</param>
       public static void main(Args _args)
       {
           str             json;
           List            values = new List(Types::String);
           ListEnumerator  value;      
           json = '[{"FieldValues": [{"parmFirst": "ValueFirst", "parmSecond": "ValueSecond", "parmList":[{"parmFirst": "ValueFirst", "parmSecond": "ValueSecond"}] }]}]';
           // Deserializing Json
           values = FormJsonSerializer::deserializeCollection(classnum(List), json, Types::Class, classStr(JSONContract));
           value = values.getEnumerator();
           while(value.moveNext())
           {
               JSONContract    JSONContractCurrent = value.current();
               info(strFmt("%1    %2",JSONContractCurrent.parmFirst(), JSONContractCurrent.parmSecond()));
           }
       }
   }