add error handling

index.js

@@ -147,6 +147,11 @@ app.post('/api/upload', [ cors(corsOptions) ], (req, res) => {
     });
 });
 
+app.use(function (err, req, res, next) {
+    console.error(err.stack);
+    res.status(500).send('Internal Server Error: Something went wrong');
+});
+
 app.listen(config.server.port, () => {
     console.log(`Started server on port ${config.server.port}`);
 });