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Repo info
    Chris Kalafarski
    Do v3 DynamodbClient commands work like the v2 DocumentClient? I.e., do they work with standard JSON data, or does it need to be typed S: foo, etc
    Steven Aerts
    @laurisvan this is how I got it working:
    {credentials: fromIni({
            roleAssumer: async (credentials, params) => {
                // no idea why we have to implement this ourselves.
                const sts = new STSClient({credentials});
                const response = await sts.send(new AssumeRoleCommand(params));
                return {
                    accessKeyId: response.Credentials.AccessKeyId,
                    secretAccessKey: response.Credentials.SecretAccessKey,
                    sessionToken: response.Credentials.SessionToken,
                    expiration: response.Credentials.Expiration,
    Boris V.Kuznetsov
    Hello! I'm new to aws-sdk-v3 Javascript. Evaluating this new lib for our new project. Currently, I'm trying to getObject with the following:
    downloadFile = async (src: String, dst: String) => {
        this.params.Key = path.basename(src);
        var outFile = fs.createWriteStream(dst);
        try {
          const data = await this.s3
            .send(new GetObjectCommand(this.params))
            .Contents.array.forEach((element) => {
          console.log("Success", data);
        } catch (err) {
          console.log("Error", err);
    I was able to reuse v2 js uploadFile, which works fine. However, this my impl creates a dstfile, but its empty (zero size). Could anybody point to my mistake? Thanks in advance !
    Boris V.Kuznetsov

    Alright... After looking at solution of @Mousaka, I came up with the working solution:

    const data = await this.s3.send(new GetObjectCommand(this.params)).then((response) => {
            const receiveObject = new Promise<Buffer>((resolve) => {
              const forBuffer = new PassThrough();
              forBuffer.on("data", (chunk) => {
              forBuffer.on("finish", () => {
          console.log("Success", data);
        } catch (err) {
          console.log("Error", err);

    Thanks for building and supporting the v3 API !

    Boris V.Kuznetsov

    Hello! How to instantiate S3Client in a browser with custom credentials? I'd like to use .env to pass creds to my JS code. Here's what I'm doing now:

    const cfg = {
      accessKeyId: process.env.KEY,
      secretAccessKey: process.env.SECRET,
      endpoint: process.env.HOST,
      s3ForcePathStyle: true,
      signatureVersion: "v4",
    const s3 = new S3Client(cfg);

    This works in Node, but fails in the browser with the following error: "vue.runtime.esm.js?5593:619 [Vue warn]: Error in created hook: "Error: Credential is missing"
    How do I work around this? Thank you!

    Cristian Barrientos Montoya
    Hi there, has anyone sign request to ElasticSearch using the sdk v3 ?
    2 replies
    Benjamin Tamasi
    Is there an example of how I can use the sdk-js-v3 to do a GraphQL query on my AppSync api?
    @aws-sdk/client-appsync seems to be for manipulating AppSync itself, I just want to query the GraphQL API
    Isaac Levy
    Is the v3 included in the node lambda enviroment -- i.e. should I mark all @aws-sdk packages as external in my webpack build?
    2 replies
    Imaduddin Haetami
    On dealing with dynamodb ProvisionedThroughputExceededException error, I am using the same approach as this second answer of the given stackoverflow question. However, it seems that v3 doesn't support it as even though I have changed maxRetries to 5 the most number of attempts logged stuck at 3 and the error still occurred. Is there any suggestion to handle this issue?
    Imaduddin Haetami
    Well, I solve the issue by provisioning higher write capacity of the dynamodb table
    Dean Shelton
    For anyone wondering how to use the new S3 getObject with Readable streams: This worked for me:
    (it's in Typescript but should work with raw JS aswell)
    import { Readable } from 'stream';
    const readStream = (stream: Readable): Promise<string> => {
      return new Promise((res, rej) => {
        let data = '';
        stream.on('data', function (chunk) { data += chunk; });
        stream.on('end', function () { res(data); });
        stream.on('error', rej);
    const params = { Bucket, Key };
    logger.debug('S3 getObject >', params);
    const result = (await s3.getObject(params)).Body as any;
    const stream = Readable.from(result);
    return readStream(stream);
    Ognjen Palija
    I've done in this way (NodeJS)
        const response = await s3.getObject({ Bucket: BUCKET, Key: imageName } );
        let file_stream = response.Body;
        let content_buffer = Buffer.from([]);
        if (file_stream instanceof Readable) {
            for await (const chunk of file_stream) {
                content_buffer = Buffer.concat([content_buffer,chunk]);
        } else {
            throw new Error('Unknown object stream type.');
    Hi guy
    Hi gals and guys, I'm getting my head arround the new Cognito interface
    I've managed login and some requests, but I'm struggling with security. Any best practices how to preserve a session in a static web application (Java Script using V3 via Webpack) so that my user doesn't have to log in every time he jumps between my various HTML files?
    Cognito side "session" function seems to be gone
    Saving Tokens in browser session seems to break OWASP best practices. Any hint appreciated.
    Eli B. Duhon
    I keep getting typescript compilation errors when attempting to use @aws-sdk/client-s3 any suggestions as to which version works?
    to be clear im trying to use it via nodejs
    Eli B. Duhon

    I keep getting typescript compilation errors when attempting to use @aws-sdk/client-s3 any suggestions as to which version works?

    After uninstalling all the @aws-sdk packages and reinstalling @aws-sdk/client-s3-node works but @aws-sdk/client-sqs no longer works and I am getting Typescript errors when attempting to use the ListQueuesCommand. ListQueuesCommand incorrectly implements interface 'Command...

    to be clear i am attempting to now use the @aws-sdk/client-sqs-node package
    Eli B. Duhon
    Are there any stable AWS-SDK V3 for JavaScript & Node.js packages?
    Eli B. Duhon
    S3CreateBucketCommand LocationConstraint does not default to "us-east-1" as indicated by the API docs and must be specified otherwise an error InvalidLocationConstraint occurs
    Emanuele Fumagalli
    Hi, I'm using the sdk 3 with DynamoDB. How is it possible to specify the endpoint when using dynamoDB running in Docker?
    Emanuele Fumagalli
    I just needed to add endpoint to DynamoDBClient
    const client = new DynamoDBClient({
    region: "us-east-1",
    endpoint: "http://localhost:8001",
    Gerard Downes
    Hi, I've just started using the client. Amazing work. The below util was great for simplifying the PutItemCommand.
    const { marshall } = require("@aws-sdk/util-dynamodb");
    Currently stuck on creating the UpdateItemCommand key parameter.
    I'm looking for an example of using the UpdateItemCommand. Any pointers/resource would be greatly appreciated.
    @laurisvan I'm having the same issue with serverless invoke local and aws-sdk v3.
    error - Profile xxxxxxxxx requires a role to be assumed, but no role assumption callback was provided.
    did you ever solve your problem?
    Eli B. Duhon
    @aws-sdk/client-dynamodb-node is missing the command TransactGetItemsCommand and TransactWriteItemsCommand
    Hello, folks. I'm trying to figure out how to turn on debug logging for the S3 client (I suspect any client would work the same way) in AWS SDK v3 for JS, so I can troubleshoot an issue I have. I couldn't find the right piece of documentation. Can anyone point me in the right direction?
    I tried setting https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-s3/interfaces/clientdefaults.html#logger to {debug: some_function}, but that didn't have the desired effect.
    Ok, now that works. I guess it was a stale client object. Never mind!
    Filip Figiel
    I'm writing a middleware for the deserialize step. I receive a HttpRequest object, but I have no idea how to send it to get the response. Please help?
    before upgrading to v3, the v2 results had a $response field I could use instead of writing a middleware
    Filip Figiel
    solved using axios, aws4 package and browser xml parser. My app serves handles non-standard IAM actions so I had most of these already in place
    Raymond Feng
    Hi, does @aws-sdk/client-dynamodb allow use of @aws-sdk/client-dax?
    Does anyone have an example of how to supply parameters to authenticate a user with cognito?
    const { CognitoIdentityClient, CreateIdentityPoolCommand } = require("@aws-sdk/client-cognito-identity");
    const client = new CognitoIdentityClient({ region: "us-east-1" });
    const params = {
        /** input parameters.  Example? */
      const command = new CreateIdentityPoolCommand(params);
      .then((data) => {
        // process data.
      .catch((error) => {
        // error handling.
        const { requestId, cfId, extendedRequestId } = error.$metadata;
        console.log({ requestId, cfId, extendedRequestId });
      .finally(() => {
        // finally.
    Jan Brauer
    Why doesn't unmarshall from @aws-sdk/util-dynamodb take a type argument like unmarshall<Foo>(item). That would be extremely helpful. Currently it's kind of hard to put the thing I get back from unmarshall to use.
    Also, did somebody succeed in getting https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/aws-lambda/trigger/dynamodb-stream.d.ts to work with unmarshall? I had to put this everywhere:
                    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
                    // @ts-ignore Property '$unknown' is missing in type.
                    const payload: Payload = unmarshall(newImage);
    Joel V

    Hello I'm having trouble accessing the AWS namespace for v3. I want to do the following here to setup kms from a RoleArn:

    const AWS = require('@aws-sdk/client-kms');
    AWS.config.credentials = new AWS.ChainableTemporaryCredentials({
          RoleArn: 'foo'
     kms = new AWS.KMS({
          region: 'us-east-1'

    I can't figure out what package to install from npm to get to the new AWS.ChainableTemporaryCredentials constructor

    Miroslav Kovar
    Hello there, can somebody please advise on how to log aws api requests? It is very handy in debugging.
    1 reply
    Jeffrey Tanner

    I am converting AWS Polly code in Javascript (node) from v2 to v3.

    Using SynthesizeSpeechCommand using OutputFormat: 'mp3', I am expecting response data.AudioStream to an instance of Buffer, but it is not:

    IncomingMessage {
       ReadableState {
         objectMode: false,
    3 replies
    Joe Stead

    Hey folks, has anyone seen issues with the sdk and using jest? I have a test which looks like this:

    import { LambdaClient, ListFunctionsCommand } from "@aws-sdk/client-lambda";
    it("ffs", async () => {
      const lambda = new LambdaClient({
        region: "eu-west-1",
      const response = await lambda.send(new ListFunctionsCommand({}));

    The test passes, but jest hangs with the output "Jest did not exit one second after the test run has completed. This usually means that there are asynchronous operations that weren't stopped in your tests."

    I've tried destroying the client at the end of the test / in an afterAll block to no success.

    This is only happening when running in our gitlab CI build (using the node12 base image from docker) and on windows. On my Mac it's absolutely fine. Any ideas?

    3 replies
    It feels like something in the client is leaking, that my Mac doesn't care about but I have no way of verifying this
    Andrew Luetgers
    Hey all, finding the transition on some basic s3 object operations a bit frustrating. I must be missing something. First I am finding the new api docs a bit less than helpful. For example put object, https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-s3/classes/putobjectcommand.html where can I find a basic usage example in any of the docs of a put object? Furthermore where can I find what the valid input attributes are to the command? Like I said I'm sure I'm missing something but it feels like the docs are extremely thick on words about all the nooks and crannies of functionality but for the 75% use case most people will just want to see some working code example and a list of command options. Instead it feels like that is not easy to find at all and we dive right into all the nitty gritty details.
    The second problem I have is quite odd as well, I know I'm accessing my object but when I try to console.log the body it seems to be some kind of client/transport wrapper object, having a hard time just logging the contents of a text file on get object sheesh some days I feel like I'm in the wrong line of work
    Hey Andrew,