diff --git a/ctx.go b/ctx.go
index 4e47103..fb216aa 100644
--- a/ctx.go
+++ b/ctx.go
@@ -89,20 +89,10 @@ type errorCall struct {
 	responseParams ErrorResponse
 }
 
-type ErrorProto struct {
-	Domain       string `json:"domain,omitempty"`
-	Reason       string `json:"reason,omitempty"`
-	Message      string `json:"message,omitempty"`
-	Location     string `json:"location,omitempty"`
-	LocationType string `json:"location_type,omitempty"`
-	ExtendedHelp string `json:"extended_help,omitempty"`
-	SendReport   string `json:"send_report,omitempty"`
-}
-
 type errorMessage struct {
-	Code    int          `json:"code"`
-	Message string       `json:"message"`
-	Errors  []ErrorProto `json:"errors,omitempty"`
+	Code    int           `json:"code"`
+	Message string        `json:"message"`
+	Errors  []interface{} `json:"errors,omitempty"`
 }
 
 type ErrorResponse struct {
@@ -129,7 +119,7 @@ func (r *errorCall) Code(code int) *errorCall {
 	return r
 }
 
-func (r *errorCall) Errors(errors []ErrorProto) *errorCall {
+func (r *errorCall) Errors(errors []interface{}) *errorCall {
 	r.responseParams.Error.Errors = errors
 	return r
 }
diff --git a/ctx_test.go b/ctx_test.go
index 8f947e0..8ae1e60 100644
--- a/ctx_test.go
+++ b/ctx_test.go
@@ -26,37 +26,62 @@ func TestCustomCtx(t *testing.T) {
 			wantJSON: `{"apiVersion": "1.0", "data": "hello world"}`,
 		},
 		{
-			name: "400",
+			name: "400 with google json style",
 			givenHandler: func(c echo.Context) error {
 
-				var errDate []ctx.ErrorProto
-
 				errCode := 40000001
 
-				errDate = append(errDate, ctx.ErrorProto{
-					Domain: "Calendar",
-					Reason: "ResourceNotFoundException",
-					Message: "Resources is not exist",
+				errData := ctx.NewErrorProto()
+
+				errData.Add(ctx.ErrorProtoItem{
+					Domain:       "Calendar",
+					Reason:       "ResourceNotFoundException",
+					Message:      "Resources is not exist",
 					LocationType: "database query",
-					Location: "query",
+					Location:     "query",
 					ExtendedHelp: "http://help-link",
-					SendReport: "http://report.dajui.com/",
+					SendReport:   "http://report.dajui.com/",
 				})
 
-				errMsg := errDate[0].Message
+				errMsg := errData.Items[0].Message
 
-				errDate = append(errDate, ctx.ErrorProto{
-					Domain: "global",
-					Reason: "required",
-					Message: "Required parameter: part",
+				errData.Add(ctx.ErrorProtoItem{
+					Domain:       "global",
+					Reason:       "required",
+					Message:      "Required parameter: part",
 					LocationType: "parameter",
-					Location: "part",
+					Location:     "part",
 				})
 
-				return c.(ctx.CustomCtx).Resp(errCode).Error(fmt.Sprintf("%v", errMsg)).Code(errCode).Errors(errDate).Do()
+				return c.(ctx.CustomCtx).Resp(errCode).Error(fmt.Sprintf("%v", errMsg)).Code(errCode).Errors(errData.AsErrors()).Do()
 			},
 			wantJSON: `{"apiVersion":"1.0","error":{"code":40000001,"message":"Resources is not exist","errors":[{"extended_help":"http://help-link", "send_report":"http://report.dajui.com/", "domain":"Calendar", "reason":"ResourceNotFoundException", "message":"Resources is not exist", "location":"query", "location_type":"database query"},{"message":"Required parameter: part", "location":"part", "location_type":"parameter", "domain":"global", "reason":"required"}]}}`,
 		},
+		{
+			name: "400 with string errors",
+			givenHandler: func(c echo.Context) error {
+
+				errCode := 40000001
+				errMsg := "Error Title"
+				errDate := ctx.NewErrors()
+				errDate.Add("Error Message 1")
+				errDate.Add("Error Message 2")
+
+				return c.(ctx.CustomCtx).Resp(errCode).Error(fmt.Sprintf("%v", errMsg)).Code(errCode).Errors(errDate.Error()).Do()
+			},
+			wantJSON: `{"apiVersion":"1.0","error":{"code":40000001,"message":"Error Title","errors":["Error Message 1","Error Message 2"]}}`,
+		},
+		{
+			name: "400 with custom struct",
+			givenHandler: func(c echo.Context) error {
+				errs := []interface{}{}
+				errs = append(errs, struct {
+					Name string `json:"name"`
+				}{"peter"})
+				return c.(ctx.CustomCtx).Resp(http.StatusOK).Error("this is error message").Errors(errs).Do()
+			},
+			wantJSON: `{"apiVersion":"1.0","error":{"code":0, "message":"this is error message", "errors":[{"name":"peter"}]}}`,
+		},
 	}
 
 	for _, tc := range tt {
diff --git a/proto.go b/proto.go
new file mode 100644
index 0000000..163e91e
--- /dev/null
+++ b/proto.go
@@ -0,0 +1,35 @@
+package ctx
+
+type ErrorProto struct {
+	Items []ErrorProtoItem
+}
+
+type ErrorProtoItem struct {
+	Domain       string `json:"domain,omitempty"`
+	Reason       string `json:"reason,omitempty"`
+	Message      string `json:"message,omitempty"`
+	Location     string `json:"location,omitempty"`
+	LocationType string `json:"location_type,omitempty"`
+	ExtendedHelp string `json:"extended_help,omitempty"`
+	SendReport   string `json:"send_report,omitempty"`
+}
+
+func NewErrorProto() *ErrorProto { return &ErrorProto{} }
+
+func NewErrorProtoItem() *ErrorProtoItem { return &ErrorProtoItem{} }
+
+func (e *ErrorProto) Add(d ErrorProtoItem) *ErrorProto {
+
+	e.Items = append(e.Items, d)
+
+	return e
+}
+
+func (e *ErrorProto) AsErrors() []interface{} {
+
+	errs := make([]interface{}, len(e.Items))
+	for i, v := range e.Items {
+		errs[i] = v
+	}
+	return errs
+}