diff --git a/pkg/runner/grpc.go b/pkg/runner/grpc.go
index 24fedf923..8053e5080 100644
--- a/pkg/runner/grpc.go
+++ b/pkg/runner/grpc.go
@@ -90,17 +90,15 @@ func (r *gRPCTestCaseRunner) RunTestCase(testcase *testing.TestCase, dataContext
 
 func invokeRequest(ctx context.Context, md protoreflect.MethodDescriptor, payload string, conn *grpc.ClientConn) (respones []string, err error) {
 	resps := make([]*dynamicpb.Message, 0)
-
 	if md.IsStreamingClient() || md.IsStreamingServer() {
-		result := gjson.Parse(payload)
-		if !result.IsArray() {
+		gpayload := gjson.Parse(payload)
+		if !gpayload.IsArray() {
 			return nil, fmt.Errorf("payload is not a JSON array")
 		}
 
-		reqs := make([]*dynamicpb.Message, len(result.Array()))
-		for i, v := range result.Array() {
-			req := dynamicpb.NewMessage(md.Input())
-			err := protojson.Unmarshal([]byte(v.Raw), req)
+		reqs := make([]*dynamicpb.Message, len(gpayload.Array()))
+		for i, v := range gpayload.Array() {
+			req,err:=getReqMessagePb(md,v.Raw)
 			if err != nil {
 				return nil, err
 			}
@@ -113,12 +111,9 @@ func invokeRequest(ctx context.Context, md protoreflect.MethodDescriptor, payloa
 		}
 
 	} else {
-		request := dynamicpb.NewMessage(md.Input())
-		if payload != "" {
-			err = protojson.Unmarshal([]byte(payload), request)
-			if err != nil {
-				return nil, err
-			}
+		request, err := getReqMessagePb(md, payload)
+		if err != nil {
+			return nil, err
 		}
 
 		resp, err := invokeRPC(ctx, conn, md, request)
@@ -128,6 +123,21 @@ func invokeRequest(ctx context.Context, md protoreflect.MethodDescriptor, payloa
 		resps = append(resps, resp)
 	}
 
+	return buildResponses(resps)
+}
+
+func getReqMessagePb(md protoreflect.MethodDescriptor, message string) (messagepb *dynamicpb.Message, err error) {
+	request := dynamicpb.NewMessage(md.Input())
+	if message != "" {
+		err := protojson.Unmarshal([]byte(message), request)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return request, nil
+}
+
+func buildResponses(resps []*dynamicpb.Message) ([]string, error) {
 	respsStr := make([]string, 0)
 	for i := range resps {
 		respbR, err := protojson.Marshal(resps[i])
@@ -289,7 +299,7 @@ func payloadFieldsVerify(caseName string, expect testing.Response, jsonPayload [
 				msg += err.Error()
 			}
 		}
-		
+
 		if msg != "" {
 			return fmt.Errorf(msg)
 		}