Creating self-executable node.js server

I would like to create an executable bash file that will execute the command node app.js - the goal is to have an executable file that can be opened on a local machine on which node is already installed and the executable is inside the project directory (It's an express.js app).

I'm trying to do it on a mac, I've written a .command file, made it executable and added the command. Problem is, the process immediately closes, as the terminal seems to automatically add exit; after the last command. I would like to do it on Windows machines also.

I don't need the entire app in an executable file, only the option to double click a file instead of opening the terminal and manually writing that simple command.

Any idea how to achieve this?

Solution

I'm afraid nothing of suggested solutions worked or was good enough to use - but I've managed to solve this using:

reldir=`dirname $0`
cd $reldir
npm start

@Gregory was the closest to the solution -

First - find the current directory path and go to it. next - differently from the command node app.js, calling npm start seems to execute after process exits, so it just kept alive.