const { createWriteStream } = require("fs"); const { pipeline } = require("stream/promises"); // Efficiently stream data from S3 to a local file async function downloadToFile(bucket, key, localPath) { const command = new GetObjectCommand({ Bucket: bucket, Key: key }); const response = await s3Client.send(command); await pipeline(response.Body, createWriteStream(localPath)); } Use code with caution. Option B: Download to a String or Buffer
: Use streams for large objects to manage memory efficiently.
The following methods use GetObjectCommand to retrieve your file. Option A: Save Directly to Local Disk (Streaming) download s3 object nodejs
Create an instance of the S3Client . It automatically loads credentials from environment variables like AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY . javascript
First, initialize your project and install the core S3 client package. npm init -y npm install @aws-sdk/client-s3 Use code with caution. 2. Configure the S3 Client const { createWriteStream } = require("fs"); const {
const { S3Client, GetObjectCommand } = require("@aws-sdk/client-s3"); const s3Client = new S3Client({ region: "us-east-1" // Replace with your bucket's region }); Use code with caution. 3. Download Options
Use the @aws-sdk/s3-request-presigner package to generate temporary, secure URLs for direct browser downloads. Summary of Best Practices : Modular design ensures smaller package sizes. Option A: Save Directly to Local Disk (Streaming)
For large files, streaming is essential to prevent high memory consumption. Use pipeline from the stream/promises module to handle errors and cleanup automatically. javascript