Nodejs application is not rendering the HTML on my vercel site

I have been facing some issue with my application that I hosted on the Vercel, but the problem i am facing is that it is only rendering response as JSON rather than the full index.html.

This is in my localhost

This is on my vercel websitehttps://task-manager-five-sepia.vercel.app/

I am not sure what is i am missing in my vercel website repo.

Expectation was that it shows me the application just like what i am able to use it in my localhost.
NOTE : Deployment related things are sorted in vercel, every change i make in my repo