diff --git a/src/lib/Node.js b/src/lib/Node.js
index 8f1847d..6df61b3 100644
--- a/src/lib/Node.js
+++ b/src/lib/Node.js
@@ -697,6 +697,7 @@ export default class Node {
 
   toJSON () {
     return {
+      id: this.id,
       text: this.text,
       data: this.data,
       state: this.states,