diff --git a/packages/node-fs/demo/node-fs.mjs b/packages/node-fs/demo/node-fs.mjs
new file mode 100644
index 00000000..8a872477
--- /dev/null
+++ b/packages/node-fs/demo/node-fs.mjs
@@ -0,0 +1,8 @@
+import {writeJsonFile, WriteFileMode} from '@alwatr/node-fs';
+
+for (let i = 10; i > 0; i--) {
+  console.log('request write file %s without waiting...', i);
+  writeJsonFile('./file.json', {i, a: 'b'}, WriteFileMode.Rename);
+}
+
+console.log('loop done, wait for queue process')