Node JS + AWS Promise Triggered Twice

AWS = require('aws-sdk');
AWS.config.region = 'eu-west-1';
ses = new AWS.SES();

var params = {};

return ses.sendEmail(params, function (err, data) {
    console.log('----->sending email')
}).promise().then((data) => {
    console.log('---->sending promise')
}).catch((err) => {
    console.log('----->am in error')
    console.log(err)
})

Can someone help my above code promise is triggered twice.

I should get below

----->sending email

---->sending promise

But i got

----->sending email

---->sending promise

----->sending email

Answers 1

  • It looks like you are providing both a callback function and using the promise approach. Effectively, this means that you have two different functions that execute when the request is done. Choose one of the following:

    You can use the promise approach, with then and catch.

    function send(params) {
        ses.sendEmail(params).promise().then((data) => {
            console.log('Email was sent')
        }).catch((err) => {
            console.log('There was an error')
        })
    }
    

    You can use promise with async/await. Make sure you add the async keyword to your function header. Make sure your Node runtime supports async/await or that you code is transpiled to whatever Node version you are using.

    async function send(params) {
        try {
            const data = await ses.sendEmail(params).promise();
            console.log('Email was sent')
        } catch(err) {
            console.log('There was an error')
        }
    }
    

    Finally, you could use the callback approach:

    function send(params) {
        ses.sendEmail(params, function(err, data) {
            if (err) {
                console.log('There was an error')
                return
            }
            console.log('Email was sent')
        })
    }
    

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