istream.js

var path = require('path'),
    fs = require('fs');

var filepath = path.join(__dirname, 'test.txt');

var readStream = fs.createReadStream(filepath, {bufferSize:4});
readStream.setEncoding('utf8');
readStream.on('data', function(data){
  console.log(data);
});
readStream.on('end', function(){
  console.log('end');
});
readStream.on('error', function(err){
  console.log('An error occured');
  console.log(err);
});