diff --git a/lego/utils/codec/factory/factory_map.go b/lego/utils/codec/factory/factory_map.go
index fe70437bb..eac42c436 100644
--- a/lego/utils/codec/factory/factory_map.go
+++ b/lego/utils/codec/factory/factory_map.go
@@ -134,6 +134,47 @@ func (encoder *sortKeysMapEncoder) Encode(ptr unsafe.Pointer, w codecore.IWriter
 	w.PutReader(subIter)
 }
 
+func (this *sortKeysMapEncoder) EncodeToMapJson(ptr unsafe.Pointer, w codecore.IWriter) (ret map[string]string, err error) {
+	ret = make(map[string]string)
+	var (
+		k, v string
+	)
+	keystream := w.GetWriter()
+	elemstream := w.GetWriter()
+	defer func() {
+		w.PutWriter(keystream)
+		w.PutWriter(elemstream)
+	}()
+	iter := this.mapType.UnsafeIterate(ptr)
+	for i := 0; iter.HasNext(); i++ {
+		key, elem := iter.UnsafeNext()
+		if this.keyEncoder.GetType() != reflect.String {
+			this.keyEncoder.Encode(key, keystream)
+			if keystream.Error() != nil && keystream.Error() != io.EOF {
+				err = keystream.Error()
+				return
+			}
+			k = BytesToString(keystream.Buffer())
+		} else {
+			k = *((*string)(key))
+		}
+		if this.elemEncoder.GetType() != reflect.String {
+			this.elemEncoder.Encode(elem, elemstream)
+			if elemstream.Error() != nil && elemstream.Error() != io.EOF {
+				err = elemstream.Error()
+				return
+			}
+			v = BytesToString(elemstream.Buffer())
+		} else {
+			v = *((*string)(elem))
+		}
+		ret[k] = v
+		keystream.Reset()
+		elemstream.Reset()
+	}
+	return
+}
+
 func (encoder *sortKeysMapEncoder) IsEmpty(ptr unsafe.Pointer) bool {
 	iter := encoder.mapType.UnsafeIterate(ptr)
 	return !iter.HasNext()