diff --git a/db.js b/db.js
new file mode 100644
index 0000000..2fba837
--- /dev/null
+++ b/db.js
@@ -0,0 +1,3 @@
+module.exports = {
+    url: process.env.MONGODB_URI || 'mongodb://localhost:27017/exam_system'
+};
\ No newline at end of file