fix json tag parsing

server/extractor.go

@@ -20,6 +20,10 @@ func extractValue(v reflect.Type, d int) *registry.Value {
 		v = v.Elem()
 	}
 
+	if len(v.Name()) == 0 {
+		return nil
+	}
+
 	arg := &registry.Value{
 		Name: v.Name(),
 		Type: v.Name(),
@@ -37,6 +41,9 @@ func extractValue(v reflect.Type, d int) *registry.Value {
 			// if we can find a json tag use it
 			if tags := f.Tag.Get("json"); len(tags) > 0 {
 				parts := strings.Split(tags, ",")
+				if parts[0] == "-" || parts[0] == "omitempty" {
+					continue
+				}
 				val.Name = parts[0]
 			}
 
@@ -45,6 +52,11 @@ func extractValue(v reflect.Type, d int) *registry.Value {
 				val.Name = v.Field(i).Name
 			}
 
+			// still no name then continue
+			if len(val.Name) == 0 {
+				continue
+			}
+
 			arg.Values = append(arg.Values, val)
 		}
 	case reflect.Slice: