`AWS_ENDPOINT_URL` env variable is not respected after the latest release

[lbeschastny]

Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

AWS_ENDPOINT_URL is no longer picked up automatically from the env.

After some digging I pinpointed this to @smithy/middleware-endpoint@4.1.14.

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/client-dynamodb@3.844.0, @aws-sdk/lib-dynamodb@3.844.0

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

v22.13.1

Reproduction Steps

Set AWS_ENDPOINT_URL to any custom value and try using DynamoDBClient:

const client = new DynamoDBClient();

Observed Behavior

Requests are sent to the default endpoint

Expected Behavior

AWS_ENDPOINT_URL should be respected

Possible Solution

Either pass it to DynamoDBClient explicitly:

const client = new DynamoDBClient({ endpoint: process.env.AWS_ENDPOINT_URL }); // this still works

or use older @smithy/middleware-endpoint version:

  "overrides": {
    "@smithy/middleware-endpoint": "4.1.13"
  }

Additional Information/Context

I already opened an issue in smithy-typescript repo, but I decided to open one here as well since it affects the sdk.

Original issue: smithy-lang/smithy-typescript#1645

[sam-super]

we are having the same issue - @lbeschastny thanks for reporting this! (and for finding the workaround). 👏

[mogu4iy]

Have same issue

[kuhe]

Thank you for reporting this issue, a fix has been released in https://www.npmjs.com/package/@smithy/middleware-endpoint/v/4.1.15.

I've set the previous version to "deprecated" on NPM with a message asking to upgrade.

To upgrade to this version, upgrade the dependency version in your package lockfile, or perform a fresh install without a lockfile.

[kuhe]

https://github.com/aws/aws-sdk-js-v3/releases/tag/v3.845.0 contains a dependency update that requires npmjs.com/package/@smithy/middleware-endpoint/v/4.1.15 or higher.

Installing this AWS SDK version, or upgrading only @smithy/middleware-endpoint to v4.1.15 would apply the fix.