diff --git a/grpc_cross_language-master/client/main.go b/grpc_cross_language-master/client/main.go
new file mode 100644
index 0000000..654fcf3
--- /dev/null
+++ b/grpc_cross_language-master/client/main.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"google.golang.org/grpc"
+	pb "test.id/learn/grpc_learn/student"
+)
+
+func getDataStudentByEmail(client pb.DataStudentClient, email string) {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	s := pb.Student{
+		Email: "rizkyian78@gmail.com",
+	}
+	student, err := client.FindStudentByEmail(ctx, &s)
+	if err != nil {
+		log.Fatalln("error when get student", err.Error())
+	}
+	fmt.Println(student)
+}
+
+func main() {
+	var opts []grpc.DialOption
+	opts = append(opts, grpc.WithInsecure())
+	opts = append(opts, grpc.WithBlock())
+
+	conn, err := grpc.Dial(":9000", opts...)
+	if err != nil {
+		log.Fatalln("error connect to server", err.Error())
+	}
+	defer conn.Close()
+	client := pb.NewDataStudentClient(conn)
+	getDataStudentByEmail(client, "rizkyian78@gmail.com")
+
+}
diff --git a/grpc_cross_language-master/client/main.js b/grpc_cross_language-master/client/main.js
new file mode 100644
index 0000000..11f72cd
--- /dev/null
+++ b/grpc_cross_language-master/client/main.js
@@ -0,0 +1,16 @@
+let grpc = require("@grpc/grpc-js")
+var protoLoader = require('@grpc/proto-loader');
+const p = require("path")
+
+var packageDefinition = protoLoader.loadSync(p.join(__dirname, "../student/student.proto"));
+
+const StudentService = grpc.loadPackageDefinition(packageDefinition).student.DataStudent;
+
+const client = new StudentService(
+    "localhost:9000",
+    grpc.credentials.createInsecure()
+  );
+
+client.FindStudentByEmail({email: "rizkaian78@gmail.com"}, (error, response) => {
+    console.log(response, "<<< ini response")
+ });
\ No newline at end of file
diff --git a/grpc_cross_language-master/client/package.json b/grpc_cross_language-master/client/package.json
new file mode 100644
index 0000000..70e5b90
--- /dev/null
+++ b/grpc_cross_language-master/client/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "client",
+  "version": "1.0.0",
+  "description": "",
+  "main": "main.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@grpc/grpc-js": "^1.6.10",
+    "path": "^0.12.7",
+    "protobufjs": "^7.0.0"
+  }
+}
diff --git a/grpc_cross_language-master/go.mod b/grpc_cross_language-master/go.mod
new file mode 100644
index 0000000..4ce63dc
--- /dev/null
+++ b/grpc_cross_language-master/go.mod
@@ -0,0 +1,13 @@
+module test.id/learn/grpc_learn
+
+go 1.17
+
+require (
+	github.com/golang/protobuf v1.5.2 // indirect
+	golang.org/x/net v0.0.0-20201021035429-f5854403a974 // indirect
+	golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 // indirect
+	golang.org/x/text v0.3.3 // indirect
+	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
+	google.golang.org/grpc v1.48.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)
diff --git a/grpc_cross_language-master/go.sum b/grpc_cross_language-master/go.sum
new file mode 100644
index 0000000..9d8e39f
--- /dev/null
+++ b/grpc_cross_language-master/go.sum
@@ -0,0 +1,135 @@
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diff --git a/grpc_cross_language-master/server/main.go b/grpc_cross_language-master/server/main.go
new file mode 100644
index 0000000..e9a6195
--- /dev/null
+++ b/grpc_cross_language-master/server/main.go
@@ -0,0 +1,69 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"sync"
+
+	"google.golang.org/grpc"
+	pb "test.id/learn/grpc_learn/student"
+)
+
+type dataStudentServer struct {
+	pb.UnimplementedDataStudentServer
+	mu      sync.Mutex
+	student []*pb.Student
+}
+
+// method
+func (d *dataStudentServer) FindStudentByEmail(ctx context.Context, strudel *pb.Student) (*pb.Student, error) {
+	for _, v := range d.student {
+		if v.Email == strudel.Email {
+			return v, nil
+		}
+	}
+	return &pb.Student{
+		Name: "tidak ada",
+	}, nil
+}
+
+// load data
+func (d *dataStudentServer) loadData() {
+	data, err := ioutil.ReadFile("student/student.json")
+	if err != nil {
+		log.Fatalln("error in read file", err.Error())
+	}
+	if err := json.Unmarshal(data, &d.student); err != nil {
+		log.Fatalln("error in unmarshalll data", err.Error())
+	}
+}
+
+func newServer() *dataStudentServer {
+	s := dataStudentServer{}
+	s.loadData()
+	return &s
+}
+
+func main() {
+	listen, err := net.Listen("tcp", ":9000")
+
+	if err != nil {
+		log.Fatalln("error in listen", err.Error())
+	}
+
+	grpcServer := grpc.NewServer()
+
+	pb.RegisterDataStudentServer(grpcServer, newServer())
+
+	fmt.Println(`Server running in address 9000`)
+
+	if err := grpcServer.Serve(listen); err != nil {
+
+		log.Fatalln("error server grpc", err.Error())
+
+	}
+}
diff --git a/grpc_cross_language-master/server/student/data.json b/grpc_cross_language-master/server/student/data.json
new file mode 100644
index 0000000..e7f4d0b
--- /dev/null
+++ b/grpc_cross_language-master/server/student/data.json
@@ -0,0 +1,12 @@
+[
+  {
+    "name": "rizky",
+    "email": "rizkyian78@gmail.com",
+    "age": 27
+  },
+  {
+    "name": "rizka",
+    "email": "rizkaian78@gmail.com",
+    "age": 26
+  }
+]
diff --git a/grpc_cross_language-master/server/student/student.json b/grpc_cross_language-master/server/student/student.json
new file mode 100644
index 0000000..e7f4d0b
--- /dev/null
+++ b/grpc_cross_language-master/server/student/student.json
@@ -0,0 +1,12 @@
+[
+  {
+    "name": "rizky",
+    "email": "rizkyian78@gmail.com",
+    "age": 27
+  },
+  {
+    "name": "rizka",
+    "email": "rizkaian78@gmail.com",
+    "age": 26
+  }
+]
diff --git a/grpc_cross_language-master/step.md b/grpc_cross_language-master/step.md
new file mode 100644
index 0000000..26162df
--- /dev/null
+++ b/grpc_cross_language-master/step.md
@@ -0,0 +1,11 @@
+# 1
+install
+
+```shell
+1. https://grpc.io/docs/protoc-installation/
+2. go get -u google.golang.org/grpc
+3. go get -u google.golang.org/protobuf
+
+pindah ke repo student lalu lakukan hal ini
+protoc --go_out=paths=source_relative:. --go-grpc_out=paths=source_relative:. student/student.proto
+```
\ No newline at end of file
diff --git a/grpc_cross_language-master/student/student.pb.go b/grpc_cross_language-master/student/student.pb.go
new file mode 100644
index 0000000..83fda7d
--- /dev/null
+++ b/grpc_cross_language-master/student/student.pb.go
@@ -0,0 +1,168 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.5
+// source: student.proto
+
+package student
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Student struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name  string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	Age   int32  `protobuf:"varint,2,opt,name=age,proto3" json:"age,omitempty"`
+	Email string `protobuf:"bytes,3,opt,name=email,proto3" json:"email,omitempty"`
+}
+
+func (x *Student) Reset() {
+	*x = Student{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_student_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Student) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Student) ProtoMessage() {}
+
+func (x *Student) ProtoReflect() protoreflect.Message {
+	mi := &file_student_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Student.ProtoReflect.Descriptor instead.
+func (*Student) Descriptor() ([]byte, []int) {
+	return file_student_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Student) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *Student) GetAge() int32 {
+	if x != nil {
+		return x.Age
+	}
+	return 0
+}
+
+func (x *Student) GetEmail() string {
+	if x != nil {
+		return x.Email
+	}
+	return ""
+}
+
+var File_student_proto protoreflect.FileDescriptor
+
+var file_student_proto_rawDesc = []byte{
+	0x0a, 0x0d, 0x73, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
+	0x07, 0x73, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x22, 0x45, 0x0a, 0x07, 0x53, 0x74, 0x75, 0x64,
+	0x65, 0x6e, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x61, 0x67, 0x65, 0x18, 0x02,
+	0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x61, 0x67, 0x65, 0x12, 0x14, 0x0a, 0x05, 0x65, 0x6d, 0x61,
+	0x69, 0x6c, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x65, 0x6d, 0x61, 0x69, 0x6c, 0x32,
+	0x47, 0x0a, 0x0b, 0x44, 0x61, 0x74, 0x61, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x12, 0x38,
+	0x0a, 0x12, 0x46, 0x69, 0x6e, 0x64, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x42, 0x79, 0x45,
+	0x6d, 0x61, 0x69, 0x6c, 0x12, 0x10, 0x2e, 0x73, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x2e, 0x53,
+	0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x1a, 0x10, 0x2e, 0x73, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74,
+	0x2e, 0x53, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x42, 0x22, 0x5a, 0x20, 0x74, 0x65, 0x73, 0x74,
+	0x2e, 0x69, 0x64, 0x2f, 0x6c, 0x65, 0x61, 0x72, 0x6e, 0x2f, 0x67, 0x72, 0x70, 0x63, 0x5f, 0x6c,
+	0x65, 0x61, 0x72, 0x6e, 0x2f, 0x73, 0x74, 0x75, 0x64, 0x65, 0x6e, 0x74, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_student_proto_rawDescOnce sync.Once
+	file_student_proto_rawDescData = file_student_proto_rawDesc
+)
+
+func file_student_proto_rawDescGZIP() []byte {
+	file_student_proto_rawDescOnce.Do(func() {
+		file_student_proto_rawDescData = protoimpl.X.CompressGZIP(file_student_proto_rawDescData)
+	})
+	return file_student_proto_rawDescData
+}
+
+var file_student_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_student_proto_goTypes = []interface{}{
+	(*Student)(nil), // 0: student.Student
+}
+var file_student_proto_depIdxs = []int32{
+	0, // 0: student.DataStudent.FindStudentByEmail:input_type -> student.Student
+	0, // 1: student.DataStudent.FindStudentByEmail:output_type -> student.Student
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_student_proto_init() }
+func file_student_proto_init() {
+	if File_student_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_student_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Student); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_student_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_student_proto_goTypes,
+		DependencyIndexes: file_student_proto_depIdxs,
+		MessageInfos:      file_student_proto_msgTypes,
+	}.Build()
+	File_student_proto = out.File
+	file_student_proto_rawDesc = nil
+	file_student_proto_goTypes = nil
+	file_student_proto_depIdxs = nil
+}
diff --git a/grpc_cross_language-master/student/student.proto b/grpc_cross_language-master/student/student.proto
new file mode 100644
index 0000000..530ee35
--- /dev/null
+++ b/grpc_cross_language-master/student/student.proto
@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+option go_package = "test.id/learn/grpc_learn/student";
+
+package student;
+
+service DataStudent {
+    rpc FindStudentByEmail(Student) returns (Student);
+}
+
+
+message Student {
+    string name = 1;
+    int32 age = 2;
+    string email = 3;
+}
\ No newline at end of file
diff --git a/grpc_cross_language-master/student/student_grpc.pb.go b/grpc_cross_language-master/student/student_grpc.pb.go
new file mode 100644
index 0000000..50966d6
--- /dev/null
+++ b/grpc_cross_language-master/student/student_grpc.pb.go
@@ -0,0 +1,105 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.21.5
+// source: student.proto
+
+package student
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// DataStudentClient is the client API for DataStudent service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type DataStudentClient interface {
+	FindStudentByEmail(ctx context.Context, in *Student, opts ...grpc.CallOption) (*Student, error)
+}
+
+type dataStudentClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewDataStudentClient(cc grpc.ClientConnInterface) DataStudentClient {
+	return &dataStudentClient{cc}
+}
+
+func (c *dataStudentClient) FindStudentByEmail(ctx context.Context, in *Student, opts ...grpc.CallOption) (*Student, error) {
+	out := new(Student)
+	err := c.cc.Invoke(ctx, "/student.DataStudent/FindStudentByEmail", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// DataStudentServer is the server API for DataStudent service.
+// All implementations must embed UnimplementedDataStudentServer
+// for forward compatibility
+type DataStudentServer interface {
+	FindStudentByEmail(context.Context, *Student) (*Student, error)
+	mustEmbedUnimplementedDataStudentServer()
+}
+
+// UnimplementedDataStudentServer must be embedded to have forward compatible implementations.
+type UnimplementedDataStudentServer struct {
+}
+
+func (UnimplementedDataStudentServer) FindStudentByEmail(context.Context, *Student) (*Student, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method FindStudentByEmail not implemented")
+}
+func (UnimplementedDataStudentServer) mustEmbedUnimplementedDataStudentServer() {}
+
+// UnsafeDataStudentServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to DataStudentServer will
+// result in compilation errors.
+type UnsafeDataStudentServer interface {
+	mustEmbedUnimplementedDataStudentServer()
+}
+
+func RegisterDataStudentServer(s grpc.ServiceRegistrar, srv DataStudentServer) {
+	s.RegisterService(&DataStudent_ServiceDesc, srv)
+}
+
+func _DataStudent_FindStudentByEmail_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Student)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DataStudentServer).FindStudentByEmail(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/student.DataStudent/FindStudentByEmail",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DataStudentServer).FindStudentByEmail(ctx, req.(*Student))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// DataStudent_ServiceDesc is the grpc.ServiceDesc for DataStudent service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var DataStudent_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "student.DataStudent",
+	HandlerType: (*DataStudentServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "FindStudentByEmail",
+			Handler:    _DataStudent_FindStudentByEmail_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "student.proto",
+}