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I am trying to implement an auto-confirm mechanism in AWS, I'm getting an error due to the Lambda response. I can't find the correct return type in the docs.


exports.handler = (event, context, callback) => {

    event.response.autoConfirmUser = true;




Unrecognizable lambda output (Service: AWSCognitoIdentityProviderService; Status Code: 400; Error Code: InvalidLambdaResponseException; Request ID: 5c7a2436-0515-11e7-b971-41a89adf53ea)

1 Answer

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by (44.5k points)

You should use context.done(null, event); or context.succeed(event) at the end of the trigger as mentioned in Cognito developer guide.

Check this documentation for more details.

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