diff --git a/maputil/map.go b/maputil/map.go
index 8df9be4..465417c 100644
--- a/maputil/map.go
+++ b/maputil/map.go
@@ -8,6 +8,9 @@ import (
 	"fmt"
 	"reflect"
 	"sort"
+	"strings"
+
+	"golang.org/x/exp/constraints"
 
 	"golang.org/x/exp/constraints"
 
@@ -378,8 +381,7 @@ func getFieldNameByJsonTag(structObj any, jsonTag string) string {
 	for i := 0; i < s.NumField(); i++ {
 		field := s.Field(i)
 		tag := field.Tag
-		name := tag.Get("json")
-
+		name, _, _ := strings.Cut(tag.Get("json"), ",")
 		if name == jsonTag {
 			return field.Name
 		}
diff --git a/maputil/map_test.go b/maputil/map_test.go
index 7d01611..9737e36 100644
--- a/maputil/map_test.go
+++ b/maputil/map_test.go
@@ -485,7 +485,7 @@ func TestMapToStruct(t *testing.T) {
 			Name  string   `json:"name"`
 			Age   int      `json:"age"`
 			Phone string   `json:"phone"`
-			Addr  *Address `json:"address"`
+			Addr  *Address `json:"address,omitempty"`
 		}
 
 		Address struct {