Run node.js modules from the command line

executable node module.md

Add one line to a node.js module and it becomes a callable script:

// hello-module.js
module.exports = function() {
return "Hello!";
};

if (!module.parent) module.exports();

Now that module can be called from the command line:

$ node hello-module.js
Hello!

The module.parent property will be null when the script is called from the command line. When module.parent is falsey, the module just calls the function which was attached to module.exports.