# @aws-sdk/middleware-flexible-checksums [![NPM version](https://img.shields.io/npm/v/@aws-sdk/middleware-flexible-checksums/latest.svg)](https://www.npmjs.com/package/@aws-sdk/middleware-flexible-checksums) [![NPM downloads](https://img.shields.io/npm/dm/@aws-sdk/middleware-flexible-checksums.svg)](https://www.npmjs.com/package/@aws-sdk/middleware-flexible-checksums) This package provides AWS SDK for JavaScript middleware that applies a checksum of the request body as a header.