test-pipe.js

if (process.argv[2] == 'child') {
  // Child process
  // Echo all stdin data.
  process.stdin.on('data', function(s) {
    console.log("Child received: " + s);
  });
  process.stdin.setEncoding('utf-8');
  process.stdin.resume();
  
} else {
  // Parent process
  // Spawn a child process, make stdin a pipe and inherit stdout/stderr.
  var child = require('child_process').spawn(process.execPath,
                                             [process.argv[1], 'child'],
                                             { customFds: [-1, 1, 2 ] });
  setInterval(function() {
    console.log("Parent: sending 'A' to child");
    child.stdin.write("A");
  }, 1000);
}