gistfile1.txt

// http://simonenko.su/8169320732/node-tumblr-my-first-nodejs-module
var Tumblr = require('tumblr').Tumblr,
    fs = require('fs');

var blog = new Tumblr(
    'YOURTUMBLELOG.tumblr.com',
    'YOURAPIKEY');

var get = function(offset) {
  offset = offset || 0;
  var options = {
    offset: offset
  };
  blog.posts(options, function(err, res) {
    if (err) {
      throw new Error(err);
    }
    if (res.posts.length == 0) {
      return;
    }
    res.posts.forEach(function(post) {
      var path = [process.cwd(), 'input', 'bands', post.id + '.json'].
          join('/');
      fs.writeFileSync(path, JSON.stringify(post));
    });
    get(offset + 20);
  });
};

get();