@howells/stow-server

Server-side SDK for Stow file storage. Use this to upload files, generate presigned URLs, and manage files from your Node.js server.

Installation

npm install @howells/stow-server
# or
pnpm add @howells/stow-server
# or
yarn add @howells/stow-server

Quick Start

import { StowServer } from "@howells/stow-server";

const stow = new StowServer(process.env.STOW_API_KEY!);

// Upload a file
const buffer = await fs.readFile("./photo.jpg");
const result = await stow.uploadFile(buffer, { filename: "photo.jpg" });
console.log(result.url);

API Reference

new StowServer(config)

Create a new Stow server instance.

// Simple: just pass the API key
const stow = new StowServer(process.env.STOW_API_KEY!);

// Advanced: pass a config object
const stow = new StowServer({
  apiKey: process.env.STOW_API_KEY!,
  baseUrl: "https://stow.sh", // optional, defaults to https://stow.sh
});

uploadFile(file, options?)

Upload a file directly from your server.

const result = await stow.uploadFile(buffer, {
  filename: "photo.jpg",
  contentType: "image/jpeg",
  route: "avatars", // optional folder/route
});

// Result:
// {
//   key: "bucket-id/avatars/abc123.jpg",
//   url: "https://stow.sh/files/bucket-id/avatars/abc123.jpg",
//   size: 12345,
//   contentType: "image/jpeg"
// }

uploadFromUrl(url, filename)

Upload a file from a URL (server-side fetch + upload).

const result = await stow.uploadFromUrl("https://example.com/image.jpg", "downloaded-image.jpg");

getPresignedUrl(filename, contentType, route?)

Get a presigned URL for client-side upload.

const { uploadUrl, fileKey, fileUrl } = await stow.getPresignedUrl(
  "photo.jpg",
  "image/jpeg",
  "avatars",
);

// Client can now PUT directly to uploadUrl

listFiles(options?)

List files in your bucket.

const { files, nextCursor } = await stow.listFiles({
  prefix: "avatars/",
  limit: 100,
  cursor: previousCursor,
});

deleteFile(key)

Delete a file by its key.

await stow.deleteFile("bucket-id/avatars/abc123.jpg");

getTransformUrl(url, options?)

Get a URL with image transform query params. Transforms are applied at the edge by the Cloudflare Worker — no server round-trip needed.

const transformedUrl = stow.getTransformUrl("https://photos.stow.sh/image.jpg", {
  width: 800,
  height: 600,
  quality: 80,
  format: "webp",
});
// → "https://photos.stow.sh/image.jpg?w=800&h=600&q=80&f=webp"

Transform options:

• width — Max width in pixels (clamped to 4096)
• height — Max height in pixels (clamped to 4096)
• quality — 1–100, quantized to nearest 5 (default: 80)
• format — "webp", "avif", "jpeg", or "png" (default: "webp")

Error Handling

All methods throw StowError on failure:

import { StowError } from "@howells/stow-server";

try {
  await stow.uploadFile(buffer);
} catch (error) {
  if (error instanceof StowError) {
    console.error(`Upload failed: ${error.message} (status: ${error.status})`);
  }
}

TypeScript

Full TypeScript support with exported types:

import type {
  StowServerConfig,
  UploadResult,
  TransformOptions,
  ListFilesResult,
} from "@howells/stow-server";

License

MIT