Express Download File From — S3 [extra Quality]

Downloading files from Amazon S3 using an Express.js backend is a standard task for modern web applications. There are two primary architectural patterns to achieve this: or generating pre-signed URLs . 1. The Proxy Stream Method

This method is best when you need to keep your S3 bucket strictly private and want to perform server-side checks (like authentication or logging) before delivering the file. express download file from s3

import { getSignedUrl } from "@aws-sdk/s3-request-presigner"; import { S3Client, GetObjectCommand } from "@aws-sdk/client-s3"; const client = new S3Client({ region: "us-east-1" }); app.get("/get-link/:filename", async (req, res) => { const command = new GetObjectCommand({ Bucket: "your-bucket-name", Key: req.params.filename, // Optional: force the browser to download instead of open ResponseContentDisposition: `attachment; filename="${req.params.filename}"`, }); try { const url = await getSignedUrl(client, command, { expiresIn: 3600 }); res.json({ url }); } catch (err) { res.status(500).send("Could not generate URL"); } }); Use code with caution. Downloading files from Amazon S3 using an Express