diskDb.js

var db = require('diskdb');

db.connect('db', ['articles']);
var article1 = {
  title : 'diskDB rocks',
  published : 'today',
  rating : '5 stars'
}

var article2 = {
  title : 'diskDB rocks',
  published : 'yesterday',
  rating : '5 stars'
}

var article3 = {
  title : 'diskDB rocks',
  published : 'today',
  rating : '4 stars'
}

db.articles.save([article1, article2, article3]);

var foundArticles = db.articles.find({rating : "5 stars", published: "yesterday"});

console.log(foundArticles);