I'm trying to establish a workflow using an API Gateway that triggers a Step Function, which then invokes a Lambda function. Currently, the API Gateway is correctly triggering the Step Function, but I'm experiencing issues with data not being passed accurately to the Lambda, leading to errors. I suspect the integration response might be at fault since I'm using VTL to transfer the JSON payload. If anyone has a similar setup or could share any insights or configurations, that would be super helpful!
4 Answers
I've set up a similar pipeline using Terraform that creates an asynchronous Slack app API with this structure (API Gateway > Step Functions (Express) > Lambda). I'm not a fan of VTL either, but it does work! Feel free to ask if you have any questions about my setup.
For long-term error handling, it might be a good idea to place an SQS queue before the Step Function. Also, instead of using VTL, you could try passing the raw response directly to the Step Function and use JSONata to transform the data afterward.
You might find this resource helpful: it's a guide on setting up API Gateway with HTTP API and Step Functions using Express. It could provide some insight into your integration.
Does the API Gateway return an HTTP 200 response when you call it? Make sure to check the error logs for more specific details on what might be going wrong.
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