server/AyaNova/biz/ObjectFields.cs

@@ -149,11 +149,16 @@ namespace AyaNova.Biz
 
             // ColumnsJSON=@"""columns"":[ {""cm"":""Widget"",""dt"":""text"",""ay"":"+ AyaType.Widget.ToString()+ "},{..etc..}]";
             sb.Append("\"columns\":[");
+            var isFirstColumn = true;
             foreach (string s in fullFields)
             {
                 ObjectField o = fields.FirstOrDefault(x => x.Key == s);
                 if (o != null)
                 {//Here is where we can vet the field name, if it doesn't exist though, for now we'll just ignore it
+                    if (!isFirstColumn)
+                    {
+                        sb.Append(",");
+                    }
                     sb.Append("{");
                     //Build required part of column definition
                     sb.Append($"\"cm\":\"{o.Key}\",\"dt\":\"{o.DataType}\"");
@@ -163,6 +168,7 @@ namespace AyaNova.Biz
                         sb.Append($",\"ay\":{o.AyObjectType}");
 
                     sb.Append("}");
+                    isFirstColumn = false;
                 }
             }
             sb.Append("]");