S3Bucket

by Nicholas C. Zakas

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Description

Lightweight JavaScript helper for making signed S3 requests using aws4fetch. Provides a small S3Bucket class with convenience methods for common object operations (head, get, put, delete).

Installation

Install from npm:

npm install @humanwhocodes/s3bucket

Usage

Import and create an S3Bucket instance. The constructor requires a baseUrl and bucket and accepts AWS credentials or the usual environment-based mechanisms.

import { S3Bucket } from "@humanwhocodes/s3bucket";

const s3 = new S3Bucket({
	baseUrl: "https://s3.amazonaws.com",
	bucket: "my-bucket",
	accessKeyId: process.env.AWS_ACCESS_KEY_ID,
	secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
	region: "us-east-1", // optional
	pathStyle: true, // optional
});

// Head an object
await s3.head("path/to/object.txt");

// Get object
const res = await s3.get("path/to/object.txt");
const body = await res.text();

// Put object
await s3.put("path/to/new.txt", "hello world", {
	headers: { "Content-Type": "text/plain" },
});

// Delete object
await s3.delete("path/to/new.txt");

Constructor options (partial):

• baseUrl (string, required): Base endpoint used to build request URLs.
• bucket (string, required): Bucket name.
• pathStyle (boolean, optional, default false): When true use path-style URLs (baseUrl/<bucket>/<path>), otherwise use baseUrl/<path>.
• accessKeyId, secretAccessKey, sessionToken, region — forwarded to aws4fetch.

Acknowledgements

This library is built on top of the excellent aws4fetch package.

License

Copyright 2025 Nicholas C. Zakas

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.