gistfile1.js

var fs      = require('fs');
var request = require('request');
var async   = require('async');
var apiUrl  = 'http://api.flickr.com/services/upload/';

var filenames = fs.readdirSync(path);
async.forEach(filenames, function(filename, callback) {
  // open a file stream on the local image
  var fileStream = fs.createReadStream(path + filename);
  // read from the file and write to the HTTP request
  fileStream.pipe(request.post(apiUrl));
  fileStream.on('end', callback);
}, function(err) {
  console.log(err ? err.message : 'Finished!');
});