How can I remove a port from url for node app using nginx

Question

My front end is divided in two parts. Part of it is on react and the other is an angular app. Both are using node/express app on port 3000. I use express-static feature on browser to dynamically handle UI to render react or angular on server.js.

I required it to run using https://example.com (which I handled using "nginx proxy"). But now it's accessible using both https://example.com:3000/ and https:example.com. I want it to be accessed only using https;//example.com without the port.

The server's api can be accessed from the places(https://example.com:3000/api/ver1)

1) ios app 
2) admin app (running differently)
3) and UI(Reactjs+angularjs)  (https://example.com)

Note- We have tried creating a separate node server for UI but that approach will cost us more. Is there any other way to achive this.

Answer 1

If you run your node server on 0.0.0.0, it becomes accessible globally.

Change yours listening port from:

app.listen(3000)

to

app.listen(3000, '127.0.0.1');

You can also block this port in IPTables as well.