@aws-sdk/middleware-flexible-checksums

What is @aws-sdk/middleware-flexible-checksums?

@aws-sdk/middleware-flexible-checksums is a middleware package for the AWS SDK for JavaScript. It provides functionality to handle flexible checksums for AWS services, ensuring data integrity during transmission.

What are @aws-sdk/middleware-flexible-checksums's main functionalities?

Adding Checksum to Requests

This feature allows you to add a checksum to your S3 PutObject requests to ensure data integrity during transmission.

const { S3Client, PutObjectCommand } = require('@aws-sdk/client-s3');
const { flexibleChecksumsMiddleware } = require('@aws-sdk/middleware-flexible-checksums');

const client = new S3Client({
  region: 'us-west-2',
});

client.middlewareStack.add(flexibleChecksumsMiddleware(), {
  step: 'build',
  priority: 'high',
});

const command = new PutObjectCommand({
  Bucket: 'example-bucket',
  Key: 'example-key',
  Body: 'Hello, world!',
});

client.send(command).then((response) => {
  console.log('Success', response);
}).catch((error) => {
  console.error('Error', error);
});

Validating Checksum in Responses

This feature allows you to validate the checksum in the response from an S3 GetObject request to ensure data integrity.

const { S3Client, GetObjectCommand } = require('@aws-sdk/client-s3');
const { flexibleChecksumsMiddleware } = require('@aws-sdk/middleware-flexible-checksums');

const client = new S3Client({
  region: 'us-west-2',
});

client.middlewareStack.add(flexibleChecksumsMiddleware(), {
  step: 'deserialize',
  priority: 'high',
});

const command = new GetObjectCommand({
  Bucket: 'example-bucket',
  Key: 'example-key',
});

client.send(command).then((response) => {
  console.log('Success', response);
}).catch((error) => {
  console.error('Error', error);
});

Other packages similar to @aws-sdk/middleware-flexible-checksums

aws-sdk

The 'aws-sdk' package is the official AWS SDK for JavaScript. It provides a comprehensive set of tools for interacting with AWS services, including S3. While it does not specifically focus on flexible checksums, it offers a wide range of functionalities for AWS services.

aws4

The 'aws4' package is a lightweight library for signing AWS requests using AWS Signature Version 4. It does not provide checksum functionality but is useful for securely signing requests to AWS services.

s3-upload-stream

The 's3-upload-stream' package is a Node.js library for streaming uploads to Amazon S3. It focuses on streaming data to S3 and does not provide checksum functionality, but it is useful for handling large file uploads.

README

@aws-sdk/middleware-flexible-checksums

This package provides AWS SDK for JavaScript middleware that applies a checksum of the request body as a header.

Changelog

3.826.0 (2025-06-06)

Features

• client-bedrock-agent-runtime: This release introduces the PromptCreationConfigurations input parameter, which includes fields to control prompt population for InvokeAgent or InvokeInlineAgent requests. (f0f84e5)
• client-kms: Remove unpopulated KeyMaterialId from Encrypt Response (b052704)
• client-rds: Include Global Cluster Identifier in DBCluster if the DBCluster is a Global Cluster Member. (8090631)
• client-rekognition: Adds support for defining an ordered preference list of different Rekognition Face Liveness challenge types when calling CreateFaceLivenessSession. (a99b352)
• client-rekognitionstreaming: adds support for defining an ordered preference list of different Rekognition Face Liveness challenge types when calling CreateFaceLivenessSession (#7118) (b17ba90)
• client-route-53: Amazon Route 53 now supports the Asia Pacific (Taipei) Region (ap-east-2) for latency records, geoproximity records, and private DNS for Amazon VPCs in that region. (7fd50fe)
• client-s3tables: S3 Tables now supports getting details about a table via its table ARN. (caebd1b)
• clients: update client endpoints as of 2025-06-06 (b879476)