diff --git a/same-tree/Cyjin-jani.js b/same-tree/Cyjin-jani.js
new file mode 100644
index 0000000000..b1efa1bed9
--- /dev/null
+++ b/same-tree/Cyjin-jani.js
@@ -0,0 +1,20 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {TreeNode} p
+ * @param {TreeNode} q
+ * @return {boolean}
+ */
+const isSameTree = function (p, q) {
+  if (p === null && q === null) return true;
+  if (p === null || q === null) return false;
+
+  if (p.val === q.val) return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
+  return false;
+};