can ScanCommand in aws-sdk lib-dynamodb fetch only n items as passed in input


Yes, the ScanCommand in the AWS SDK for JavaScript’s DocumentClient can fetch only a specified number of items by using the Limit parameter in the input options.

Here’s an example of how to use the Limit parameter to fetch only n items using the ScanCommand:

const AWS = require('aws-sdk');
const { DocumentClient } = AWS.DynamoDB;

const dynamodb = new DocumentClient();

const params = {
  TableName: 'my-table',
  Limit: 10 // Fetch only 10 items

dynamodb.scan(params, (err, data) => {
  if (err) {
    console.error('Unable to scan the table:', JSON.stringify(err, null, 2));
  } else {
    console.log('Scan succeeded:', JSON.stringify(data, null, 2));

In this example, we create a params object with the TableName property set to the name of the DynamoDB table we want to scan, and the Limit property set to 10, indicating that we want to fetch only 10 items.

We then pass this params object to the scan method of the DocumentClient instance. When the scan is executed, only 10 items will be returned in the data object.

Note that the Limit parameter can be any value between 1 and 1000. If you want to fetch more than 1000 items, you will need to use pagination to retrieve the remaining items.