AWS SDK v3 SQS SendMessage


Has anyone been successful is sending a message to AWS SQS using the JavaScript SDK v3? This is inside of an Atlas function.

It simply will not work for me with a fifo queue.

The same function has no issues interacting with S3.

The error when trying to send an SQS message is that data must be a string or a buffer. (The data is a string)

I know the code works though because identical code, package, etc. works in node 18.

Thank you in advance!

Hi Dima,
Can you share your code snippet and the full error message you’re seeing? Thanks!

Hello Michael,

Absolutely and thank you for responding.

One function is for the aws config (credentials and region) in aws_getConfig.js:

exports = async function () {
    const AWS_CONFIG = {
      credentials: {
        accessKeyId: context.environment.values['AWS_ACCESS_KEY_ID'],
        secretAccessKey: context.values.get('AWS_SECRET_KEY_VALUE'),
      region: context.values.get("AWS_REGION"),
    return AWS_CONFIG

The function that tries to make the SQS call is triggered by a database trigger (it actually does both S3 and SQS - S3 works, SQS does not) - in Atlas_Triggers_ETL_Function:

exports = async function(changeEvent) {

    const AWS_CONFIG = await context.functions.execute('aws_getConfig')

    const { S3Client, PutObjectCommand } = require('@aws-sdk/client-s3')
    const { SQSClient, SendMessageCommand } = require('@aws-sdk/client-sqs')

    const { S3_BUCKET_ETL_ENV, SQS_QUEUE_ETL_URLS } = context.environment.values
    const S3Bucket = context.values.get("S3_ETL_BUCKET")
    if (changeEvent && (changeEvent.operationType == 'insert' || changeEvent.operationType == 'delete' ||  changeEvent.operationType == 'update')) {
        const s3 = new S3Client(AWS_CONFIG)
        const sqs = new SQSClient(AWS_CONFIG)
        const collection = changeEvent.ns.coll
        const SQSQueueUrl = SQS_QUEUE_ETL_URLS[collection.toLowerCase()]
        let objectsToPutInS3 = [], objectsToPutInS3ForSQS = []
        const fullStringBody = changeEvent.fullDocument ? JSON.stringify(changeEvent.fullDocument) : JSON.stringify(changeEvent.documentKey)
        const baseKeyName = S3_BUCKET_ETL_ENV + "/" + collection + "/" + changeEvent.documentKey._id  + "-" +
        if(fullStringBody) {
            const anObj = {
                Bucket: S3Bucket,
                Key: baseKeyName,
                Body: fullStringBody
            objectsToPutInS3.push(new PutObjectCommand(anObj))
        const s3Promises = => s3.send(object).then(data => {
            console.log('S3 put object result: ' + JSON.stringify(data))
            return data
        await Promise.all(s3Promises)

        const sqsMsgBody = JSON.stringify({
            operation: changeEvent.operationType,
            S3FilePartsOfJSONDocument: => {return {Bucket: object.Bucket, Key: object.Key}})

        console.log(`SQSQueueUrl: ${SQSQueueUrl} and is of type ${typeof SQSQueueUrl}`)
        //"" and is of type string

        console.log(`collection: ${collection} and is of type ${typeof collection}`)
        //"users" and is of type string

        console.log(`sqsMsgBody: ${sqsMsgBody} and is of type ${typeof sqsMsgBody}`)
        //something like: "{\"operation\":\"update\",\"S3FilePartsOfJSONDocument\":[{\"Bucket\":\"bucket-name\",\"Key\":\"dev/users/5bb2377885432223fg-1690592434481\"}]}" and is of type string

        console.log(`baseKeyName: ${baseKeyName} and is of type ${typeof baseKeyName}`)
        //something like: "dev/users/5bb2377885432223fg-1690592434481" and is of type string
        //Everything is fine up to here
        try {
            const sqsResult = await sqs.send(new SendMessageCommand({
                QueueUrl: SQSQueueUrl,
                MessageGroupId: collection,
                MessageBody: sqsMsgBody,
                MessageDeduplicationId: baseKeyName
        } catch (e) {
            console.log('Error writing to SQS: ' + e)
            //error is: "TypeError: Data must be a string or a buffer"

So, the full error message is "“TypeError: Data must be a string or a buffer”

The package.json looks like this:


Thank you!

We arrived at this post as we are also facing the exact same problem with the V3 aws-sdk and SendMessageCommand.

Hi Mark,

Glad to know that I am not alone in this. Thanks for the reply.

As a result we are looking at EventBridge triggers instead, though looks like it will complicate the setup a little, particularly for your scenario.

Hey @Dima @mpobrien any updates on this