Using the AWS javascript SDK, V3, is there a credentials provider chain equivalent?

Question

I'm migrating from V2 to V3 of the javascript SDK for AWS, using NodeJS. Our application needs to check for credentials in a couple places. Previously we used the Credential Provider Chain but I cannot find the equivalent in V3. I need to look in the shared INI file (SharedIniFileCredential) when my script runs locally but the script also runs in kubernetes so (I think) I also need roleAssumerWithWebIdentity. How do I use a credential chain in V3?

Answer 1

The module @aws-sdk/credential-provider-node provides a default credential provider similar to what you're looking for:

It will attempt to find credentials from the following sources (listed in order of precedence):

• Environment variables exposed via process.env
• SSO credentials from token cache
• Web identity token credentials
• Shared credentials and config ini files
• The EC2/ECS Instance Metadata Service

Here's an example from their page:

const { getDefaultRoleAssumerWithWebIdentity } = require("@aws-sdk/client-sts");
const { defaultProvider } = require("@aws-sdk/credential-provider-node");
const { S3Client, GetObjectCommand } = require("@aws-sdk/client-s3");

const provider = defaultProvider({
  roleAssumerWithWebIdentity: getDefaultRoleAssumerWithWebIdentity,
});

const client = new S3Client({ credentialDefaultProvider: provider });