Is there any way to make an API within the same URL of React.js application just like Next.js?

In Next.js, I can access my application on localhost:3000, and access to my API from localhost:3000/api/hello .

Is there any way to do this by using React.js and some other framework like Express.js?

What is the solution if I don't want to use Next.js?

Both on development and production.

EDIT:

In production:

I just deployed my express.js app to my shared hosting using app.listen() and it works fine because in production we don't or we shouldn't specify the port as I know.

So there's no need to worry about ports being different just because they are in development.

In develoment:

I haven't tried anything yet but as jcubic mentioned maybe we need a proxy.

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