How to Get Signed S3 Url in AWS-SDK JS Version 3?

Just add my example in TypeScript:

import { S3Client, GetObjectCommand, S3ClientConfig } from '@aws-sdk/client-s3'; import { getSignedUrl } from '@aws-sdk/s3-request-presigner'; const s3Configuration: S3ClientConfig = { credentials: { accessKeyId: '<ACCESS_KEY_ID>', secretAccessKey: '<SECRET_ACCESS_KEY>' }, region: '<REGION>', }; const s3 = new S3Client(s3Configuration); const command = new GetObjectCommand({Bucket: '<BUCKET>', Key: '<KEY>' }); const url = await getSignedUrl(s3, command, { expiresIn: 15 * 60 }); // expires in seconds console.log('Presigned URL: ', url); 

Here's my function for this. It has a bit more meat on the bone than the online documentation. It's all compatible with esbuild for tree shaking and minying the code. Some of my lambda functions that use this actually pack down into less than 10kB in size, by leveraging all the bundling and minifying options.

import { S3Client, PutObjectCommand, GetObjectCommand } from "@aws-sdk/client-s3"; import { getSignedUrl } from "@aws-sdk/s3-request-presigner"; let s3Client; // Singleton Initiation function singletonS3Client() { if (!s3Client) { s3Client = new S3Client({}); } return s3Client; } /** * Generate a presigned URL for S3 operations (upload/download) * @param {string} bucketName - S3 bucket name * @param {string} key - Object key in S3 * @param {number} expiry - Expiration time in seconds * @param {string} method - 'getObject' for download, 'putObject' for upload * @param {string} contentType - Optional MIME type (e.g., 'image/jpeg', 'image/png') * @returns {Promise<string>} - Presigned URL */ async function presignedUrl(bucketName, key, expiry = 3600, method = 'getObject', contentType = null) { // Check Method const validMethods= ['getObject', 'putObject']; if (!validMethods.includes(method)) { throw {errCode: 400, errMsg: "Invalid Method. Use 'getObject' or 'putObject'."}; } // Build params object const s3Params = { Bucket: bucketName, Key: key }; // Add content type for image uploads if provided if (method === 'putObject' && contentType) { s3Params.ContentType = contentType; } console.log('Generating presigned URL with params:', s3Params); // Initialise client s3Client = singletonS3Client(); // Generate presigned url try { let command; if (method === 'getObject') { command = new GetObjectCommand(s3Params); } else { command = new PutObjectCommand(s3Params); } const url = await getSignedUrl(s3Client, command, { expiresIn: expiry }); return url; } catch(err) { console.log('error:', err); throw new Error("Failed to generate secure url."); } }