Downloading files from Amazon S3 using Go is a fundamental task for any cloud-based application. This guide explores how to use the to perform everything from simple single-file downloads to high-performance concurrent transfers of large objects. Getting Started with the AWS SDK for Go v2
For large files (up to 50 TB as of recent updates), AWS recommends using the . It automatically splits files into chunks and downloads them in parallel, significantly improving speed. golang s3 download
go get github.com/aws/aws-sdk-go-v2 go get github.com/aws/aws-sdk-go-v2/config go get github.com/aws/aws-sdk-go-v2/service/s3 go get github.com/aws/aws-sdk-go-v2/feature/s3/manager Use code with caution. Downloading files from Amazon S3 using Go is
import ( "context" "io" "os" "github.com/aws/aws-sdk-go-v2/service/s3" ) // Example: Stream from S3 to a local file func SimpleDownload(client *s3.Client, bucket, key, destPath string) error { result, err := client.GetObject(context.TODO(), &s3.GetObjectInput{ Bucket: &bucket, Key: &key, }) if err != nil { return err } defer result.Body.Close() file, err := os.Create(destPath) if err != nil { return err } defer file.Close() _, err = io.Copy(file, result.Body) return err } Use code with caution. It automatically splits files into chunks and downloads
: It requires an io.WriterAt (like a local file) to handle out-of-order chunk writing.