The [AWS SDK for JavaScript V3 API Reference Guide](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/) describes in detail all the API operations for the AWS SDK for JavaScript version 3 (V3). 

# Configure maxSockets in Node.js
<a name="node-configuring-maxsockets"></a>

In Node.js, you can set the maximum number of connections per origin. If ` maxSockets` is set, the low-level HTTP client queues requests and assigns them to sockets as they become available.

This lets you set an upper bound on the number of concurrent requests to a given origin at a time. Lowering this value can reduce the number of throttling or timeout errors received. However, it can also increase memory usage because requests are queued until a socket becomes available.

The following example shows how to set `maxSockets` for a DynamoDB client.

```
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import { NodeHttpHandler } from "@smithy/node-http-handler";
import https from "https";    
let agent = new https.Agent({
  maxSockets: 25
});

let dynamodbClient = new DynamoDBClient({
  requestHandler: new NodeHttpHandler({
    requestTimeout: 3_000,
    httpsAgent: agent
  });
});
```

The SDK for JavaScript uses a `maxSockets` value of 50 if you do not supply a value or an `Agent` object. If you supply an `Agent` object, its `maxSockets` value will be used. For more information about setting `maxSockets` in Node.js, see the [Node.js documentation](https://nodejs.org/dist/latest/docs/api/http.html#http_agent_maxsockets).

As of v3.521.0 of the AWS SDK for JavaScript, you can use the following [shorthand syntax](https://github.com/aws/aws-sdk-js-v3/blob/main/supplemental-docs/CLIENTS.md#new-in-v35210) to configure `requestHandler`.

```
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";

const client = new DynamoDBClient({
  requestHandler: {
    requestTimeout: 3_000,
    httpsAgent: { maxSockets: 25 },
  },
});
```