Parent-child communication using messages in Node.js

child.js

process.on('message', function(m) {
  console.log('Just received a message from parent: ' + JSON.stringify(m));
  if (m.exit === "true") process.exit();
});

output.txt

$ node parent.js
Just received a message from parent: {"foo":5}
Just received a message from parent: {"exit":"true"}
$ 

parent.js

var cp = require('child_process');

var n = cp.fork('./child.js');
n.send({ foo: 5 });
n.send({ exit: 'true' });