Update global validation pipe configuration

src/main.ts

@@ -25,7 +25,14 @@ async function bootstrap() {
 
   setupSwaggerAuthentication(app);
 
-  app.useGlobalPipes(new ValidationPipe());
+  app.useGlobalPipes(
+    new ValidationPipe({
+      transform: true, // Auto-transform payloads to their DTO instances.
+      transformOptions: {
+        enableImplicitConversion: true, // Convert incoming payloads to their DTO instances if possible.
+      },
+    }),
+  );
 
   await app.listen(process.env.PORT || 4000);
 }