Is it possible to use AWS Powertools Parser ZOD together with batchItemFailures for SQS?

Yes, it is possible to use AWS Powertools Parser with Zod together with batchItemFailures for SQS, but you'll need to implement a custom solution to handle this scenario effectively.

The AWS Powertools Parser utility with Zod provides data validation and parsing for AWS Lambda functions, including support for SQS events. However, you're correct in noting that the Parser typically processes records individually and doesn't inherently maintain the messageId, which is crucial for reporting batchItemFailures.

To combine these functionalities, you can create a custom approach:

1. Use the Parser to validate and parse each SQS message as it comes in.
2. Before parsing, store the messageId in a separate data structure (e.g., a Map or an array) that you can reference later.
3. Process your messages using the parsed data.
4. If any message fails processing, add its messageId to a list of batch item failures.
5. At the end of your Lambda function, return the batchItemFailures list in the correct format.

Here's a conceptual example of how you might structure this:

1. Create a Map to store messageIds alongside their parsed data.
2. Use Middy to set up your Lambda handler with the Parser middleware.
3. In your main handler function:
   • Iterate through the SQS records.
   • For each record, store the messageId and use the Parser to validate and parse the message body.
   • Process the parsed data.
   • If processing fails, add the messageId to a batchItemFailures array.
4. At the end of processing, return an object with the batchItemFailures.

This approach allows you to leverage the benefits of the Powertools Parser for data validation while still maintaining the ability to report specific message failures back to SQS.

Remember to handle errors appropriately and ensure that your Lambda function has the necessary permissions to work with SQS and report batch item failures.

By implementing this custom solution, you can effectively use AWS Powertools Parser with Zod in conjunction with batchItemFailures reporting for your SQS queue processing in AWS Lambda.
Sources
Parser (Zod) - Powertools for AWS Lambda (TypeScript)
Batch Processing - Powertools for AWS Lambda (TypeScript)
Community | Handling partial batch failures with the SQS Lambda Poller