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The correct approach is to use AWS SAM CLI with the sam local invoke command and provide a sample SQS event JSON file as input to simulate the queue trigger. AWS SAM (Serverless Application Model) CLI is specifically designed to help developers test Lambda functions locally before deploying to AWS. The 'sam local invoke' command allows you to invoke a Lambda function locally with a simulated event. For SQS-triggered Lambda functions, you can create a JSON file that mimics the exact structure of an SQS event (including Records array, messageId, body, messageAttributes, etc.) and pass it to the command using the --event flag. This approach: - Accurately simulates the SQS event structure that Lambda receives - Allows testing of message parsing and attribute handling - Requires no AWS infrastructure or costs during local development - Is the AWS-recommended approach for local Lambda testing The option suggesting Redis to mimic SQS behavior is incorrect because Redis is a completely different service with different data structures and APIs. This would require significant custom code and wouldn't accurately represent how SQS events are structured when triggering Lambda. The option using 'sam local start-api' is incorrect because this command is specifically designed for testing API Gateway-triggered Lambda functions, not SQS-triggered functions. It starts a local HTTP server to simulate API Gateway, which is not relevant for queue-based triggers. The option suggesting deploying to a test AWS account first defeats the purpose of local testing. The developer specifically wants to test locally before any deployment. While this approach could eventually work, it adds unnecessary complexity, deployment time, and potential AWS costs when SAM CLI provides a straightforward local testing solution.