Why does AWS Lambda function return null?


My AWS Lambda function sends an email through SNS, but the response is null in the Lambda console. I used a blueprint provided by AWS and put the code in a Lambda handler using Node.js 10.x.


I am not that experienced in the use of promises in node.js and my research on Stack Overflow seems to indicate that could be the problem here.

The result is that I receive the email message inconsistently and see a null response in the Lambda console. Here is a sample log result:


Your lambda is exiting before completing the promise. To circumvent this you can use async-await:

OR, You can return the promise, return publishTextPromise.then(...).catch(...)

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