code: function createDitcherInstance(mongoUrl, callback) {
    // Default config used by ditcher if no connection string
    // is provided
    var config = {
      database: {
        host: process.env.MONGODB_HOST || '127.0.0.1',
        port: process.env.FH_LOCAL_DB_PORT || 27017,
        name: 'FH_LOCAL'
      }
    };
  
    if (mongoUrl) {
      try {
        config = utils.parseMongoConnectionURL(mongoUrl);
      } catch(e) {
        return callback(e);
      }
    }
  
    var versString = (mongoUrl) ? "db per app" : "shared db";
    var ditcher = new fhditcher.Ditcher(config, logger, versString, function () {
      return callback(null, ditcher);
    });
  }
docs: Create a ditcher instance in case we are working with a shared
  database.
  
  @param mongoUrl Mongodb connection string to be used
  @param callback result callback