diff --git a/base/res_field.go b/base/res_field.go
index beecea0..4e223fe 100644
--- a/base/res_field.go
+++ b/base/res_field.go
@@ -1,7 +1,6 @@
 package base
 
 import (
-	"encoding/json"
 	"fmt"
 	"reflect"
 	"strconv"
@@ -117,17 +116,17 @@ func (this ResField) ToValue(v any) any {
 	case contracts.ResDataType_Json:
 		if v == nil {
 			if this.Default != "" && this.Default[0:1] == "[" {
-				return "[]"
+				return db.Raw("'[]'")
 			} else if this.Default != "" && this.Default[0:1] == "{" {
-				return "{}"
+				return db.Raw("'{}'")
 			} else if this.Default == "" {
-				return "{}"
+				return db.Raw("'{}'")
 			}
 
 			return this.Default
 		}
-		b, _ := json.Marshal(v)
-		return string(b)
+
+		return v
 	}
 
 	return strings.Trim(cast.ToString(v), " ")