UUID Generator

Generate UUID v1 or UUID v4 values on demand. UUID stands for Universally Unique Identifier and is used to uniquely identify data across systems.

• UUID v1: Time-based and can reveal when it was generated.
• UUID v4: Randomly generated and the default choice for most applications.

Example format (36 characters with hyphens):

f47ac10b-58cc-4372-a567-0e02b2c3d479

• Primary keys in databases.
• Public IDs in APIs and URLs.
• Correlation IDs for logs and tracing.
• Identifiers for files, sessions, or events.

UUIDs are 128-bit identifiers with a very large address space. Collisions are considered practically negligible for typical application use.

Use the uuid npm package and call uuidv4().

import { v4 as uuidv4 } from 'uuid';
uuidv4(); // returns new UUID

Use the Guid.NewGuid(); Method.

Guid myUUID = Guid.NewGuid();
Console.WriteLine(myUUID);

Import the uuid library and call uuid.uuid4().

import uuid
uuid.uuid4()

See the Python 2 docs and Python 3 docs for more information.

• GUID Structure
• Universally unique identifier - Wikipedia
• RFC 4122- A Universally Unique IDentifier (UUID)

Use the Generate GUID Online Tool for GUID terminology.

Are UUIDs secure secrets? No. UUIDs identify records; they do not encrypt data.

Which UUID version should I use? Use v4 unless you need time ordering from v1.

Can UUIDs collide? Collisions are practically negligible for most applications.