JSON output (response) messages

Output messages are JSON objects named "response". This object contains properties that are mapped to ABL parameters defined as OUTPUT, INPUT-OUTPUT, and return-value parameters. The property names are identical to the parameter names that are mapped to the RESPONSE_BODY. The return value is named "_retVal"

All ABL parameters types that are supported by OpenEdge REST applications, and that can be represented as JSON objects are supported. This includes datasets and temp-tables. See the Output parameter mapping for more information about supported ABL parameter types.

{"response":
  {"Param1":"String param",
   "Param2":true
   "Param3": [{
     "Country": "United Kingdom",
     "Name": "Just Joggers Limited",
     "Address": "Fairwind Trading Est",
     "Address2": "Shoe Lane",
     "City": "Ramsbottom",
     "State": "Sussex",
     "PostalCode": "BL0 9ND",
     "Contact": "George Lacey",
     "Phone": "070 682 2887",
     "SalesRep": "SLS",
     "CreditLimit": 22000.00,
     "Balance": 1222.11,
     "Terms": "Net30",
     "Discount": 20,
     "Comments": "This is a modified record",
     "Fax": "",
     "EmailAddress": ""
    }],
    "_retVal":"Some return string"
  }
}

If there is no return value because you are calling an external procedure or internal procedure and the useReturnValue attribute is set to "FALSE" in the annotation, there will be no _retVal property in the response message. If the parameter is UNKNOWN, it will have a value of null in the message.