lambda-trigger-post-confirmation.js - AWS Code Sample


/* Copyright, Inc. or its affiliates. All Rights Reserved. SPDX-License-Identifier: Apache-2.0 ABOUT THIS NODE.JS EXAMPLE: This example works with AWS SDK for JavaScript version 3 (v3), which is pending release. The preview version of the SDK is available at This example is in the 'AWS SDK for JavaScript v3 Developer Guide' at Purpose: lambda-trigger-post-confirmation.js is an AWS Lambda function that sends a confirmation email message to your user using Amazon SES. Running the code: 1. On the AWS Lambda service dashboard, choose Create function. 2. On the Create function page, name the function, and choose Create function. 3. Copy and paste the code into the index.js file in the editor, and save the function. 4. Open the Amazon Cognito service. 5. Choose Manage user pools. 6. Choose the user pool you want to add the trigger to. (If you don't have a user pool, create one.) 7. In General Settings, choose Triggers. 8. In the Post confirmation pane, select the Lambda function. */ // Import required AWS SDK clients and commands for Node.js const { SES, SendEmailCommand } = require("@aws-sdk/client-ses"); // Set the AWS Region const REGION = "region"; //e.g. "us-east-1" const ses = new SES(); exports.handler = async (event, context) => { console.log(event); if ( { await sendTheEmail(, "Congratulations " + event.userName + ", you have been confirmed:" ); { // Return to Amazon Cognito return null, event; } } else { // Nothing to do, the user's email ID is unknown return null, event; } }; const sendTheEmail = async (to, body) => { const eParams = { Destination: { ToAddresses: [to], }, Message: { Body: { Text: { Data: body, }, }, Subject: { Data: "Cognito Identity Provider registration completed", }, }, // Replace source_email with your SES validated email address Source: "<source_email>", }; try { const email = await ses.send(new SendEmailCommand(eParams)); console.log("===EMAIL SENT==="); } catch (err) { console.log(err); } };