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UUID Use Case

UUID Mock ID

When mocking an API, give its resources UUID IDs so your stubs behave like the real thing.

Stub-safeUniquev4

Version

How many

Uppercase Hyphens Braces { }

Result

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

What Is UUID Mock ID?

A mock ID stands in for a real external identifier. A UUID keeps mocks realistic and distinct from production values.
This prevents a test that accidentally talks to the real service from clashing with mock data.

How to generate

Assign UUIDs in your mock server's responses.
Keep a map from mock id to canned object.
Never reuse a production-shaped id in mocks.

Use Cases

Contract testing.
Offline development.
Chaos simulation.

Code Examples

JavaScript

const id = crypto.randomUUID();

Python

import uuid
id = uuid.uuid4()

Frequently Asked Questions

Mock ID format matter?

It should match what the real service returns (UUIDs, here) so tests do not encode wrong assumptions.

Reuse mock IDs across tests?

Prefer fresh per test run to avoid stateful coupling, unless a test pins a specific value.

Related tools

UUID v1 Generator UUID v3 Generator UUID v4 Generator UUID v5 Generator UUID v6 Generator UUID v7 Generator UUID v8 Generator Bulk UUID Generator Short UUID Generator UUID Validator UUID Formatter UUID as a Primary Key UUID Database ID UUID Foreign Key UUID Shard Key UUID Partition Key UUID in a Composite Key UUID Surrogate Key UUID API Key UUID Session Token UUID Access Token UUID Refresh Token UUID Idempotency Key UUID Request ID UUID Correlation ID UUID Trace ID UUID CSRF Token UUID Nonce UUID Filename UUID Object Key UUID S3 Key UUID Upload ID UUID Cache Key UUID Blob Name UUID Temp File UUID User ID UUID Account ID UUID Customer ID UUID Device ID UUID Tenant ID UUID Client ID UUID Anonymous ID UUID Member ID UUID Message ID UUID Event ID UUID Job ID UUID Task ID UUID Queue Message ID UUID Transaction ID UUID Order ID UUID Invoice ID UUID Payment ID UUID Reset Token UUID Verification Token UUID Invite Code UUID API Secret UUID Share Link UUID Magic Link UUID Node ID UUID Worker ID UUID Lock ID UUID Cluster ID UUID Test Data UUID Seed Data UUID Fixture UUID Mock ID UUID Placeholder ID UUID Sample ID