i have this old project i need to run on :
please i dont know how can i cofigure the vercel.json please
i did this :

{
    "rewrites": [{ "source": "/(.*)", "destination": "/index.html" }]
  }

but i can only run the front hmmm

any idea please?

i tried to deploy them separated front and back but stuck in the back how to run it in the hhh its an express application