Use jsoniter to improve performance

utils/ToJSON.go

@@ -1,9 +1,9 @@
 package utils
 
-import "encoding/json"
+import jsoniter "github.com/json-iterator/go"
 
 // ToJSON converts an object to a JSON string, ignoring errors.
 func ToJSON(v interface{}) string {
-	str, _ := json.Marshal(v)
+	str, _ := jsoniter.Marshal(v)
 	return string(str)
 }