Understanding Process I/O Pipes

The process module provides access to the standard I/O pipes for the process stdin, stdout, and stderr. stdin is the standard input pipe for the process, which is typically the console. That means that you can read input from the console by using the following code:

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process.stdin.on('data', function(data){
  console.log("Console Input: " + data);
});

Then when you type in data to the console and press Enter, the data is written back out. For example:

some data
Console Input: some data

The stdout and stderr attributes of the process module are Writable streams that can be treated accordingly.