InvalidInputProcessingForFoodAdtvAPI

 var express = require('express');
 var request = require('request');
-
 //xml을 json으로 바꾼다.
 const convert = require('xml-js');
 
+var ProductCategoryName = '스위트초콜릿'; 
+
 var url = 'http://apis.data.go.kr/1470000/FoodAdtvInfoService/getFoodAdtvInfoList';
 var key ='ofY2ppOq5kBqT5jYPaGsW%2BEy7OR5a1bf5Z9PHvqNKvwO5DSCaU2x2qCj%2FoXnuB1YVbMTlErkHWSMEsR5b7isrw%3D%3D';
 var queryParams = '?' + encodeURIComponent('ServiceKey') + '=' +key; 
 //queryParams += '&' + encodeURIComponent('prdlst_cd') + '=' + encodeURIComponent('C0118010300000'); 
-queryParams += '&' + encodeURIComponent('pc_kor_nm');// + '=' + encodeURIComponent('스위트초콜릿'); 
-queryParams += '&' + encodeURIComponent('pageNo') + '=' + encodeURIComponent('213'); 
-queryParams += '&' + encodeURIComponent('numOfRows') + '=' + encodeURIComponent('100'); 
+queryParams += '&' + encodeURIComponent('pc_kor_nm') + '=' + encodeURIComponent(ProductCategoryName); 
+//queryParams += '&' + encodeURIComponent('pageNo') + '=' + encodeURIComponent('213'); 
+//queryParams += '&' + encodeURIComponent('numOfRows') + '=' + encodeURIComponent('100'); 
 
-global.foods = new Array();
 
 
 request({
@@ -26,25 +26,34 @@ request({
         if(response.statusCode ==200){
             var result =body;
             var xmltojson = convert.xml2json(result,{compact:true,spaces:4});
-            //console.log(xmltojson);
             var resObj = eval("("+xmltojson+")");
             var resultItems = resObj.response.body.items;
-            //console.log(xmltojson);
+            var resultLeng = Object.keys(resultItems);
 
+            if(Object.keys(resultItems).length != 0){
+                console.log("valid input : 식품 첨가물 정보를 받아옵니다.");
                 
+                var responseMessage ='[ ' + resultItems.item[0].PC_KOR_NM._text + ' ]\n';
+                //하나의 카테고리에 대한 정보만 받는다고 가정해 반복문 밖으로 뺐습니다.
 
-            for(var i=0 ; i < resultItems.item.length; i ++){
-                var responseMessage ='[ ' + resultItems.item[i].PC_KOR_NM._text + ' ]\n';
+                for(var i=0 ; i < resultItems.item.length; i ++)
+                {
+                    //var responseMessage ='[ ' + resultItems.item[i].PC_KOR_NM._text + ' ]\n';
                     var addictive = resultItems.item[i].T_KOR_NM._text;
                     var specVal = resultItems.item[i].SPEC_VAL_SUMUP._text;
                     var yn = resultItems.item[i].INJRY_YN._text;
                     responseMessage += addictive + ' : ' + specVal + '['+yn+']'+ '\n';
-                console.log('[responese message]',responseMessage);
                 }
                 
             }
+            else
+            {
+                console.log("Invalid Input : 에러 메시지 전송");
+                var responseMessage = "잘못 된 입력입니다. 라벨의 식품유형을 확인하고 다시 입력해주세요.";
+            }
+                console.log('[responese message]',responseMessage);
+            
+        }
     }
-    //console.log('Status', response.statusCode);
-    //console.log('Headers', JSON.stringify(response.headers));
-    //console.log('Reponse received', body);
+
 });