UUID Generator

UUID Versions Explained

UUID v4 vs ULID

For most modern applications, the choice is between UUID v4 and ULID:

UUID v4: 550e8400-e29b-41d4-a716-446655440000

• Completely random — no ordering
• Universally supported
• Standard choice for database primary keys

ULID: 01ARZ3NDEKTSV4RRFFQ69G5FAV

• Lexicographically sortable (can sort by creation time)
• Better database index performance for time-series data
• Same 128-bit uniqueness as UUID

Generating UUIDs in Code

# Python
import uuid
print(uuid.uuid4())  # Random UUID v4
print(uuid.uuid5(uuid.NAMESPACE_URL, "https://example.com"))  # Deterministic v5

// Node.js / Browser
import { v4 as uuidv4 } from 'uuid';
console.log(uuidv4());

UUIDs in Automation Workflows

UUIDs are essential for idempotency — processing the same webhook or event exactly once. When building automation pipelines with Make, n8n, or custom code, assign a UUID to each event at ingestion and use it to deduplicate retries — a pattern covered in more depth in Python + FastAPI Webhook Automation.