Iterate over all mongo documents in a collection

traverse.js

var mongo = require('mongodb');

var config = {
  host: 'localhost',
  port: '27017',
  db: 'local',
};

var getDBAsync = function(config) {
  return new Promise(function(resolve, reject) {
    var server = new mongodb.Server(config.host, config.port, {});
    
    new mongodb.Db(config.db, server, { safe: true }).open(function(err, db) {
      if (err) { return reject(err); }
      resolve(db);
    });
  });
};

getDBAsync(config).then(function(db) {
  var cursor = db.find({});
  
  // new inserted documents after the above find won't be returned by `nextCursor`;
  cursor.nextCursor(function(err, doc) {
  });
});