sigv4-lite

AWS SigV4 signing for runtimes without Node’s crypto module — Cloudflare Workers, Deno, Bun, browsers. Works with S3, R2, B2, Wasabi, and any other SigV4-compatible endpoint.

Zero dependencies. Uses Web Crypto (crypto.subtle) only.

By ProfessionalFlare.

Install

npm install sigv4-lite

Quick start

import { signRequest } from "sigv4-lite";

const headers = await signRequest({
  method: "PUT",
  url: "https://my-bucket.s3.amazonaws.com/file.txt",
  body: "hello world",
  accessKeyId: env.ACCESS_KEY_ID,
  secretAccessKey: env.SECRET_ACCESS_KEY,
  region: "us-east-1",
});

await fetch("https://my-bucket.s3.amazonaws.com/file.txt", {
  method: "PUT",
  headers,
  body: "hello world",
});

See API for the full reference and Examples for a Cloudflare Worker + R2 walkthrough.