block3.js

function onScan(err, data) {
  if (err) console.log(err, err.stack);
  else {
    for (var idx = 0; idx < data.Items.length; idx++) {
      data_stream.append(JSON.stringify(data.Items[idx]));
      data_stream.append("\n");
    }

    if (typeof data.LastEvaluatedKey != "undefined") {
      params.ExclusiveStartKey = data.LastEvaluatedKey;
      dynamo.scan(params, onScan);
    }
    else {
      data_stream.end()
    }
  }
}