AWS Cognito: Creating aws cognito user from express app within lambda function using aws-sdk is giving time out

[PrajapatiDhara1510]

I am creating a cognito user from serverless express within lambda function using aws-sdk in node js.

I tried with plain lambda function by creating a cognito user, and it works. Below working is my code:

const {CognitoIdentityProviderClient, AdminCreateUserCommand} = require("@aws-sdk/client-cognito-identity-provider");

const region = "us-east-1";
const userPoolId = "us-east-1_xxxxxxx";
const cognitoClient = new CognitoIdentityProviderClient({region});


/**
 * @type {import('@types/aws-lambda').APIGatewayProxyHandler}
 */
exports.handler = async (event) => {
    const email = "dhara@testest.com";
    const password = "dhara?123";
    const name = "Dhara";

    const createUserParams = {
        UserPoolId: userPoolId, // Replace with your User Pool ID
        Username: email,
        TemporaryPassword: password,
        UserAttributes: [
            {
                Name: "email",
                Value: email,
            },
            {
                Name: "preferred_username",
                Value: name,
            },
        ],
        MessageAction: "SUPPRESS",
    };

    try {
        const user = await cognitoClient.send(new AdminCreateUserCommand(createUserParams));
        console.log("User created successfully:", user);
    } catch (error) {
        console.log("Error creating user:", error);
    }
    return {
        statusCode: 200,
        body: JSON.stringify('Hello from Lambda!'),
    };
};

The above code successfully creates a user in cognito and gives success response. But when I try the same with serverless express and lambda function, it just gives time out—not creating users at all. Below is the code:

const express = require('express')
const bodyParser = require('body-parser')
const awsServerlessExpressMiddleware = require('aws-serverless-express/middleware')

const {CognitoIdentityProviderClient, AdminCreateUserCommand} = require("@aws-sdk/client-cognito-identity-provider");

const region = "us-east-1";
const userPoolId = "us-east-1_xxxxxx";
const cognitoClient = new CognitoIdentityProviderClient({region});

// declare a new express app
const app = express()
app.use(bodyParser.json())
app.use(awsServerlessExpressMiddleware.eventContext())

// Enable CORS for all methods
app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*")
  res.header("Access-Control-Allow-Headers", "*")
  next()
});

app.post('/api/v1/users/test', async function(req, res) {
  const createUserParams = {
    UserPoolId: userPoolId, // Replace with your User Pool ID
    Username: "dhara@testest.com",
    TemporaryPassword: "Dhara?123",
    UserAttributes: [
      {
        Name: "email",
        Value: "dhara@testest.com",
      },
      {
        Name: "preferred_username",
        Value: "Test",
      },
    ],
    MessageAction: "SUPPRESS",
  };
  try {
    console.log('try starts');
    const response = await cognitoClient.send(new AdminCreateUserCommand(createUserParams));
    console.log(response);
  } catch (error) {
    res.status(500).json({ error: error });
  }
  res.status(201).json({ status:"success"});
});

app.listen(3000, function() {
    console.log("App started")
});

module.exports = app

I am stuck from last many days. Not getting the correct issue. Any help is appreciated.