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Upgrading Notes (2.x to 3.x)

This document captures notable changes from AWS SDK for JavaScript v2 to v3. The v3 is also known as modular AWS SDK for JavaScript.

Because v3 is a modular rewrite of v2, some basic conceptions are different between v2 and v3. You can learn about these changes in our blog posts. The following blog posts will get you up to speed:

The summary of interface changes from AWS SDK for JavaScript v2 to v3 is given below. The goal is to help you easily find the v3 equivalents of the v2 APIs you are already familiar with.

Client Constructors

This list is indexed by v2 config parameters.

  • computeChecksums

    • v2: Whether to compute MD5 checksums for payload bodies when the service accepts it (currently supported in S3 only).
    • v3: applicable commands of S3 (PutObject, PutBucketCors, etc.) will automatically compute the MD5 checksums for of the request payload. You can also specify a different checksum algorithm in the commands' ChecksumAlgorithm parameter to use a different checksum algorithm. You can find more infomation in the S3 feature announcement

  • convertResponseTypes

    • v2: Whether types are converted when parsing response data.
    • v3: Deprecated. This option is considered not type-safe because it doesn't convert the types like time stamp or base64 binaries from the JSON response.

  • correctClockSkew

    • v2: Whether to apply a clock skew correction and retry requests that fail because of an skewed client clock.
    • v3: Deprecated. SDK always applies a clock skew correction.

  • systemClockOffset

    • v2: An offset value in milliseconds to apply to all signing times.
    • v3: No change.

  • credentials

  • endpointCacheSize

    • v2: The size of the global cache storing endpoints from endpoint discovery operations.
    • v3: No change.

  • endpointDiscoveryEnabled

    • v2: Whether to call operations with endpoints given by service dynamically.
    • v3: No change.

  • hostPrefixEnabled

    • v2: Whether to marshal request parameters to the prefix of hostname.
    • v3: Deprecated. SDK always injects the hostname prefix when necessary.

  • httpOptions

    A set of options to pass to the low-level HTTP request. These options are aggregated differently in v3. You can configure them by supplying a new requestHandler. Here's the example of setting http options in Node.js runtime. You can find more in v3 reference for NodeHttpHandler.

    All v3 requests use HTTPS by default. You only need to provide custom httpsAgent.

    const { Agent } = require("https");
const { Agent: HttpAgent } = require("http");
const { NodeHttpHandler } = require("@smithy/node-http-handler");
const dynamodbClient = new DynamoDBClient({
  requestHandler: new NodeHttpHandler({
    httpsAgent: new Agent({
      /*params*/
    }),
    connectionTimeout: /*number in milliseconds*/
    socketTimeout: /*number in milliseconds*/
  }),
});

    If you are passing custom endpoint which uses http, then you need to provide httpAgent.

    const { Agent } = require("http");
const { NodeHttpHandler } = require("@smithy/node-http-handler");

const dynamodbClient = new DynamoDBClient({
  requestHandler: new NodeHttpHandler({
    httpAgent: new Agent({
      /*params*/
    }),
  }),
  endpoint: "http://example.com",
});

    If the client is running in browsers, a different set of options is available. You can find more in v3 reference for FetchHttpHandler.

    const { FetchHttpHandler } = require("@smithy/fetch-http-handler");
const dynamodbClient = new DynamoDBClient({
  requestHandler: new FetchHttpHandler({
    requestTimeout: /*number in milliseconds*/
  }),
});

    Each option of httpOptions is specified below:

    • proxy

    • agent

      • v2: The Agent object to perform HTTP requests with. Used for connection pooling.
      • v3: You can configure httpAgent or httpsAgent as shown in the examples above.

    • connectTimeout

      • v2: Sets the socket to timeout after failing to establish a connection with the server after connectTimeout milliseconds.
      • v3: connectionTimeout is available in NodeHttpHandler options.

    • timeout

      • v2: The number of milliseconds a request can take before automatically being terminated.
      • v3: socketTimeout is available in NodeHttpHandler options.

    • xhrAsync

      • v2: Whether the SDK will send asynchronous HTTP requests.
      • v3: Deprecated. Requests are always asynchronous.

    • xhrWithCredentials

  • logger

    • v2: An object that responds to .write() (like a stream) or .log() (like the console object) in order to log information about requests.
    • v3: No change. More granular logs are available in v3.

  • maxRedirects

    • v2: The maximum amount of redirects to follow for a service request.
    • v3: Deprecated. SDK does not follow redirects to avoid unintentional cross-region requests.

  • maxRetries

    • v2: The maximum amount of retries to perform for a service request.
    • v3: Changed to maxAttempts. See more in v3 reference for RetryInputConfig. Note that the maxAttempt should be maxRetries + 1.

  • paramValidation

    • v2: Whether input parameters should be validated against the operation description before sending the request.
    • v3: Deprecated. SDK does not do validation on client-side at runtime.

  • region

    • v2: The region to send service requests to.
    • v3: No change. It can also be an async function that returns a region string.

  • retryDelayOptions

    • v2: A set of options to configure the retry delay on retryable errors.
    • v3: Deprecated. SDK supports more flexible retry strategy with retryStrategy client constructor option. See more in v3 reference

  • s3BucketEndpoint

    • v2: Whether the provided endpoint addresses an individual bucket (false if it addresses the root API endpoint).
    • v3: Changed to bucketEndpoint. See more in v3 reference for bucketEndpoint. Note that when set to true, you specify the request endpoint in the Bucket request parameter, the original endpoint will be overwritten. Whereas in v2, the request endpoint in client constructor overwrites the Bucket request parameter.

  • s3DisableBodySigning

    • v2: Whether to disable S3 body signing when using signature version v4.
    • v3: Renamed to applyChecksum

  • s3ForcePathStyle

    • v2: Whether to force path style URLs for S3 objects.
    • v3: Renamed to forcePathStyle

  • s3UseArnRegion

    • v2: Whether to override the request region with the region inferred from requested resource's ARN.
    • v3: Renamed to useArnRegion

  • s3UsEast1RegionalEndpoint

    • v2: When region is set to 'us-east-1', whether to send s3 request to global endpoints or 'us-east-1' regional endpoints.
    • v3: Deprecated. S3 client will always use regional endpoint if region is set to us-east-1. You can set the region to aws-global to send requests to S3 global endpoint.

  • signatureCache

    • v2: Whether the signature to sign requests with (overriding the API configuration) is cached.
    • v3: Deprecated. SDK always caches the hashed signing keys.

  • signatureVersion

    • v2: The signature version to sign requests with (overriding the API configuration).
    • v3: Deprecated. Signature V2 supported in v2 SDK has been deprecated by AWS. v3 only supports signature v4.

  • sslEnabled

    • v2: Whether SSL is enabled for requests.
    • v3: Renamed to tls.

  • stsRegionalEndpoints

    • v2: Whether to send sts request to global endpoints or regional endpoints.
    • v3: Deprecated. STS client will always use regional endpoints if set to a specific region. You can set the region to aws-global to send request to STS global endpoint.

  • useAccelerateEndpoint

    • v2: Whether to use the Accelerate endpoint with the S3 service.
    • v3: No change.

Credential Providers

In v2, the SDK provides a list of credential providers to choose from, as well as a credentials provider chain, available by default on Node.js, that tries to load the AWS credentials from all the most common providers. V3 simplifies the credential provider's interface, making it easier to use and write custom credential providers. On top of a new credentials provider chain, V3 all provides a list of credential providers aiming to provide equivalent to v2.

Here is all the credential providers in v2 and their equivalents in v3.

Default Credential Provider

Default credential provider is how SDK resolve the AWS credential if you DO NOT provide one explicitly.

Temporary Credentials

  • v2: ChainableTemporaryCredentials Represents temporary credentials retrieved from AWS.STS. Without any extra parameters, credentials will be fetched from the AWS.STS.getSessionToken() operation. If an IAM role is provided, the AWS.STS.assumeRole() operation will be used to fetch credentials for the role instead. AWS.ChainableTemporaryCredentials differs from AWS.TemporaryCredentials in the way masterCredentials and refreshes are handled. AWS.ChainableTemporaryCredentials refreshes expired credentials using the masterCredentials passed by the user to support chaining of STS credentials. However, AWS.TemporaryCredentials recursively collapses the masterCredentials during instantiation, precluding the ability to refresh credentials which require intermediate, temporary credentials.

    The original TemporaryCredentials has been deprecated in favor of ChainableTemporaryCredentials in v2.

  • v3: Temporary Credentials Provider. You can call fromTemporaryCredentials() from @aws-sdk/credential-providers package. Here's an example:

    import { FooClient } from "@aws-sdk/client-foo";
import { fromTemporaryCredentials } from "@aws-sdk/credential-providers"; // ES6 import
// const { FooClient } = require("@aws-sdk/client-foo");
// const { fromTemporaryCredentials } = require("@aws-sdk/credential-providers"); // CommonJS import

const sourceCredentials = {
  // A credential can be a credential object or an async function that returns a credential object
};
const client = new FooClient({
  credentials: fromTemporaryCredentials({
    masterCredentials: sourceCredentials,
    params: { RoleArn },
  }),
});

Cognito Identity Credentials

Load credentials from Cognito Identity service, normally used in browsers.

  • v2: CognitoIdentityCredentials Represents credentials retrieved from STS Web Identity Federation using the Amazon Cognito Identity service.

  • v3: Cognito Identity Credential Provider The @aws/credential-providers package provides two credential provider functions, one of which fromCognitoIdentity takes an identity ID and calls cognitoIdentity:GetCredentialsForIdentity, while the other fromCognitoIdentityPool takes an identity pool ID, calls cognitoIdentity:GetId on the first invocation, and then callsfromCognitoIdentity. Subsequent invocations of the latter do not re-invoke GetId

    The provider implements the "Simplified Flow" described in the Cognito developer guide. The "Classic Flow" which involves calling cognito:GetOpenIdToken and then calling sts:AssumeRoleWithWebIdentity is NOT supported. Please open a feature request to us if you need it.

    // fromCognitoIdentityPool example
import { fromCognitoIdentityPool } from "@aws-sdk/credential-providers"; // ES6 import
// const { fromCognitoIdentityPool } = require("@aws-sdk/credential-providers"); // CommonJS import

const client = new FooClient({
  region: "us-east-1",
  credentials: fromCognitoIdentityPool({
    clientConfig: cognitoIdentityClientConfig, // Optional
    identityPoolId: "us-east-1:1699ebc0-7900-4099-b910-2df94f52a030",
    customRoleArn: "arn:aws:iam::1234567890:role/MYAPP-CognitoIdentity", // Optional
    logins: {
      // Optional
      "graph.facebook.com": "FBTOKEN",
      "www.amazon.com": "AMAZONTOKEN",
      "api.twitter.com": "TWITTERTOKEN",
    },
  }),
});
    // fromCognitoIdentity example
import { fromCognitoIdentity } from "@aws-sdk/credential-providers"; // ES6 import
// const { fromCognitoIdentity } = require("@aws-sdk/credential-provider-cognito-identity");

const client = new FooClient({
  region: "us-east-1",
  credentials: fromCognitoIdentity({
    clientConfig: cognitoIdentityClientConfig, // Optional
    identityId: "us-east-1:128d0a74-c82f-4553-916d-90053e4a8b0f",
    customRoleArn: "arn:aws:iam::1234567890:role/MYAPP-CognitoIdentity", // Optional
    logins: {
      // Optional
      "graph.facebook.com": "FBTOKEN",
      "www.amazon.com": "AMAZONTOKEN",
      "api.twitter.com": "TWITTERTOKEN",
    },
  }),
});

EC2 Metadata(IMDS) Credential

Represents credentials received from the metadata service on an EC2 instance.

  • v2: EC2MetadataCredentials

  • v3: fromInstanceMetadata: Creates a credential provider that will source credentials from the EC2 Instance Metadata Service.

    import { fromInstanceMetadata } from "@aws-sdk/credential-providers"; // ES6 import
// const { fromInstanceMetadata } = require("@aws-sdk/credential-providers"); // CommonJS import

const client = new FooClient({
  credentials: fromInstanceMetadata({
    maxRetries: 3, // Optional
    timeout: 0, // Optional
  }),
});

ECS Credentials

Represents credentials received from specified URL. This provider will request temporary credentials from URI specified by the AWS_CONTAINER_CREDENTIALS_RELATIVE_URI or the AWS_CONTAINER_CREDENTIALS_FULL_URI environment variable.

  • v2: ECSCredentials or RemoteCredentials.

  • v3: fromContainerMetadata creates a credential provider that will source credentials from the ECS Container Metadata Service.

    import { fromContainerMetadata } from "@aws-sdk/credential-providers"; // ES6 import

const client = new FooClient({
  credentials: fromContainerMetadata({
    maxRetries: 3, // Optional
    timeout: 0, // Optional
  }),
});

File System Credentials

  • v2: FileSystemCredentials
    represents credentials from a JSON file on disk.
  • v3: Deprecated. You can explicitly read the JSON file and supply to the client. Please open a feature request to us if you need it.

SAML Credential Provider

Shared Credential File Credentials

Loads credentials from shared credentials file (defaulting to ~/.aws/credentials or defined by the AWS_SHARED_CREDENTIALS_FILE environment variable). This file is supported across different AWS SDKs and tools. You can refer to the shared config and credentials files document for more information.

  • v2: SharedIniFileCredentials

  • v3: fromIni.

    import { fromIni } from "@aws-sdk/credential-providers";
// const { fromIni } from("@aws-sdk/credential-providers");

const client = new FooClient({
  credentials: fromIni({
    configFilepath: "~/.aws/config", // Optional
    filepath: "~/.aws/credentials", // Optional
    mfaCodeProvider: async (mfaSerial) => {
      // implement a pop-up asking for MFA code
      return "some_code";
    }, // Optional
    profile: "default", // Optional
    clientConfig: { region }, // Optional
  }),
});

Web Identity Credentials

Retrieves credentials using OIDC token from a file on disk. It's commonly used in EKS.

  • v2: TokenFileWebIdentityCredentials.

  • v3: fromTokenFile

    import { fromTokenFile } from "@aws-sdk/credential-providers"; // ES6 import
// const { fromIni } from("@aws-sdk/credential-providers"); // CommonJS import

const client = new FooClient({
  credentials: fromTokenFile({
    // Optional. If skipped, read from `AWS_ROLE_ARN` environmental variable
    roleArn: "arn:xxxx",
    // Optional. If skipped, read from `AWS_ROLE_SESSION_NAME` environmental variable
    roleSessionName: "session:a",
    // Optional. STS client config to make the assume role request.
    clientConfig: { region },
  }),
});

Web Identity Federation Credentials

Retrieves credentials from STS web identity federation support.

  • v2: WebIdentityCredentials

  • v3: fromWebToken

    import { fromWebToken } from "@aws-sdk/credential-providers"; // ES6 import
// const { fromWebToken } from("@aws-sdk/credential-providers"); // CommonJS import

const client = new FooClient({
  credentials: fromWebToken({
    // Optional. If skipped, read from `AWS_ROLE_ARN` environmental variable
    roleArn: "arn:xxxx",
    // Optional. If skipped, read from `AWS_ROLE_SESSION_NAME` environmental variable
    roleSessionName: "session:a",
    // Optional. STS client config to make the assume role request.
    clientConfig: { region },
  }),
});

S3 Multipart Upload

In v2, the S3 client contains an upload() operation that supports uploading large objects with multipart upload feature offered by S3.

In v3, @aws-sdk/lib-storage package is available. It supports all the features offered in v2 upload(), and supports both Node.js and browsers runtime.

S3 Presigned URL

In v2, the S3 client contains getSignedUrl() and getSignedUrlPromise() operations to generate an URL that users can use to upload or download objects from S3.

In v3, @aws-sdk/s3-request-presigner package is available. You don't have to differentiate getSignedUrl() and getSignedUrlPromise() any more. We also have a blog discussing the details of this package.

DynamoDB Document Client

In v2, you can use the AWS.DynamoDB.DocumentClient class to call DynamoDB API with native JavaScript types like Buffer, Array, and Object. It thus simplifies working with items in Amazon DynamoDB by abstracting away the notion of attribute values.

In v3, equivalent @aws-sdk/lib-dynamodb is available. It's similar to normal service clients from v3 SDK, with the difference that it takes a basic DynamoDB client in its constructor. Here's an brief example:

import { DynamoDBClient } from "@aws-sdk/client-dynamodb"; // ES6 import
// const { DynamoDBClient } = require("@aws-sdk/client-dynamodb"); // CommonJS import
import { DynamoDBDocumentClient, PutCommand } from "@aws-sdk/lib-dynamodb"; // ES6 import
// const { DynamoDBDocumentClient, PutCommand } = require("@aws-sdk/lib-dynamodb"); // CommonJS import

// Bare-bones DynamoDB Client
const client = new DynamoDBClient({});

// Bare-bones document client
const ddbDocClient = DynamoDBDocumentClient.from(client); // client is DynamoDB client

await ddbDocClient.send(
  new PutCommand({
    TableName,
    Item: {
      id: "1",
      content: "content from DynamoDBDocumentClient",
    },
  })
);

More examples and configurations are available in the package README.

Waiters

In v2, all waiters are bound to the service client class, you need to specify in waiter's input which designed state the client will be waiting for. For example, you need to call waitFor("bucketExists") to wait for a newly created bucket to be ready.

In v3, you don't need to import waiters if your application doesn't need one. Moreover, you can import only the waiter you need to wait for the particular desired state you want. Thus, you can reduce your bundle size and improve performance. Here's the example of waiting for bucket to be ready after creation:

import { S3Client, CreateBucketCommand, waitUntilBucketExists } from "@aws-sdk/client-s3"; // ES6 import
// const { S3Client, CreateBucketCommand, waitUntilBucketExists } = require("@aws-sdk/client-s3"); // CommonJS import

const Bucket = "BUCKET_NAME";
const client = new S3Client({ region: "REGION" });
const command = new CreateBucketCommand({ Bucket });

await client.send(command);
await waitUntilBucketExists({ client, maxWaitTime: 60 }, { Bucket });

You can find everything of how to configure the waiters in the blog post of waiters in v3 SDK.

CloudFront Signer

In v2, you can sign the request to access restricted CloudFront distributions with AWS.CloudFront.Signer.

In v3, you have the same utilities provided in the @aws-sdk/cloudfront-signer package.

RDS Signer

In v2, you can generate the auth token to an RDS database using AWS.RDS.Signer.

In v3, the similar utility class is available in @aws-sdk/rds-signer package.

Polly Signer

In v2, you can generate a signed URL to the speech synthesized by AWS Polly service with AWS.Polly.Presigner class.

In v3, the similar utility function is available in @aws-sdk/polly-request-presigner package

Notes on Specific Service Clients

Lambda

Lambda invocations response type differs in v3:

import { Lambda } from "@aws-sdk/client-lambda";
import AWS from "aws-sdk";

const region = "...";

{
  // v2
  const lambda = new AWS.Lambda({ region });
  const invoke = await lambda
    .invoke({
      FunctionName: "echo",
      Payload: JSON.stringify({ message: "hello" }),
    })
    .promise();
  // in v2, Lambda::invoke::Payload is automatically converted to string via a
  // specific code customization.
  const payloadIsString = typeof invoke.Payload === "string";
  console.log("Invoke response payload type is string:", payloadIsString);

  const payloadObject = JSON.parse(invoke.Payload);
  console.log("Invoke response object", payloadObject);
}

{
  const lambda = new Lambda({ region });
  const invoke = await lambda.invoke({
    FunctionName: "echo",
    Payload: JSON.stringify({ message: "hello" }),
  });
  // in v3, Lambda::invoke::Payload is not automatically converted to a string.
  // This is to reduce the number of customizations that create inconsistent behaviors.
  const payloadIsByteArray = invoke.Payload instanceof Uint8Array;
  console.log("Invoke response payload type is Uint8Array:", payloadIsByteArray);

  // To maintain the old functionality, only one additional method call is needed:
  // v3 adds a method to the Uint8Array called transformToString.
  const payloadObject = JSON.parse(invoke.Payload.transformToString());
  console.log("Invoke response object", payloadObject);
}