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UUID Use Case

UUID Upload ID

Large uploads are split into parts. A UUID upload ID ties the parts to one logical upload, enabling pause, resume, and parallel puts.

ResumablePart groupingv4

Version

How many

Uppercase Hyphens Braces { }

Result

Generated locally with the Web Crypto API — nothing leaves your browser.

What Is UUID Upload ID?

A multipart upload is identified by an upload ID. Each part references it, so the store knows which blob they belong to.
A v4 UUID is a safe, conflict-free ID even when many uploads run concurrently.

How to generate

Create the upload and get a UUID id.
Tag each part with that id.
Complete the upload once all parts arrive.

Use Cases

Video ingestion.
Backup chunk uploads.
Mobile resumable photo uploads.

Code Examples

JavaScript

const id = crypto.randomUUID();

Python

import uuid
id = uuid.uuid4()

Frequently Asked Questions

Why a UUID and not a counter?

Concurrent uploads from many clients need globally unique IDs without a shared sequence.

Can I resume after a crash?

Yes — the upload ID lets you query which parts completed and continue from there.

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