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Guide Shows Direct Browser Uploads to Private Object Storage With Node.js, Express and React

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The article recommends using a private storage bucket in which a Node.js/Express server issues a short-lived presigned PUT URL for each receipt upload. Under this design the server never proxies file bytes but controls the bucket and object key, keeping the original file available for audit. Access is granted only after an authenticated tenant check, when the server generates a temporary presigned download URL. The author suggests structuring object keys by tenant and receipt ID, deriving them server-side rather than accepting them from the browser. Several storage options are compared, including Amazon S3, Cloudflare R2, Google Cloud Storage and Infrai, with the choice depending on existing infrastructure and compliance needs.

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