
AWS Lambda error handling patterns enable resilient event-driven applications by using dead-letter queues and destinations to capture and process failed messages across synchronous, asynchronous, and poll-based invocation types.


<div><p>This article explains three AWS Lambda error handling patterns for building resilient event-driven serverless applications.</p><ul><li>Poll-based invocation: Lambda polls SQS queues; configure DLQ to retain failed messages</li><li>Asynchronous invocation with DLQ: SNS/EventBridge send events; DLQ captures undelivered messages</li><li>Asynchronous invocation with destinations: Lambda destinations route success/failure to SQS, SNS, EventBridge, or Lambda</li><li>Destinations preferred over DLQs; include function response details and stack traces</li><li>Configure retry attempts (0-2) and max event age (up to 6 hours) for async invokes</li><li>Deployable code examples available in AWS CDK Python repository</li></ul><p>These patterns help recover from delivery and processing failures in distributed, loosely-coupled serverless applications.</p></div>


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