From http://www.sitepoint.com/accessing-the-file-system-in-node-js/

accessing-the-file-system-in-node-js.js

var fs = require("fs");
var fileName = "foo.txt";

fs.exists(fileName, function(exists) {
  if (exists) {
    fs.stat(fileName, function(error, stats) {
      fs.open(fileName, "r", function(error, fd) {
        var buffer = new Buffer(stats.size);

        fs.read(fd, buffer, 0, buffer.length, null, function(error, bytesRead, buffer) {
          var data = buffer.toString("utf8", 0, buffer.length);

          console.log(data);
          fs.close(fd);
        });
      });
    });
  }
});