diff --git a/server/db-mongodb.js b/server/db-mongodb.js
index b0d62cd..a29ad0f 100644
--- a/server/db-mongodb.js
+++ b/server/db-mongodb.js
@@ -13,7 +13,14 @@ export function generateUUID() {
   });
 }
 
-const MONGODB_URI = process.env.MONGODB_URI || 'mongodb://127.0.0.1:27017';
+function getMongoUri() {
+  const envUri = (process.env.MONGODB_URI || '').trim();
+  if (envUri.startsWith('mongodb://') || envUri.startsWith('mongodb+srv://')) {
+    return envUri;
+  }
+  return 'mongodb://127.0.0.1:27017';
+}
+
 const DB_NAME = process.env.DB_NAME || 'hospital';
 
 let client;
@@ -62,7 +69,8 @@ const memStore = {
 
 export async function initDb() {
   try {
-    client = new MongoClient(MONGODB_URI, {
+    const uri = getMongoUri();
+    client = new MongoClient(uri, {
       connectTimeoutMS: 5000,
       serverSelectionTimeoutMS: 5000
     });