example.js

var JsonDB = require('./index').JsonDB;
var async = require('async');

var db;

async.series([
  function(callback) {
    db = new JsonDB(':memory:', function(err) {
      console.log('db opened');
      callback(err);
    });
  },
  function(callback) {
    // create a store for 'obj' type object with an index for the field 'a'
    db.initialize('obj', [['a']], function(err) {
      if (err) {
        console.error('Error initializing db', err);
      }
      else {
        console.log('done initializing');
      }
      callback(err);
    });
  },
  function(callback) {
    console.log('saving ...');
    db.save({ a: 50, b: 60, lat: 37.11111111111, lon: 44.44444444444 }, 'obj', function(err) {
      console.log('saved');
      callback(err);
    });
  },
  function(callback) {
    console.log('find without index ...');
    db.find('obj', { b: 60 }, function(err, items) {
      if (items[0].b !== 60) throw new Error('item not found');
      callback(err);
    });
  },
  function(callback) {
    console.log('find with index ...');
    db.find('obj', { a: 50 }, function(err, items) {
      if (items[0].a !== 50) throw new Error('item not found');
      callback(err);
    });
  },
  function(callback) {
    db.close(function(err) {
      console.log('db closed');
      callback(err);
    });  
  },
]);