var Datastore = require('nedb')
  , db = new Datastore({ filename: 'testdb.db', autoload: true });\
var doc = { hello: 'world'
               , n: 5
               , today: new Date()
               , nedbIsAwesome: true
               , notthere: null
               , notToBeSaved: undefined  // Will not be saved
               , fruits: [ 'apple', 'orange', 'pear' ]
               , infos: { name: 'nedb' }
               };
db.insert(doc, function (err, newDoc) {   
    console.log(newDoc);
});
I can't find "testdb.db" anywhere in my computer, but the console log show the data exist! Any suggestion?