UUID Generator
Create one or many UUIDs for tests, seeds, and data models.
Runs locally in your browser.
UUID V4 values
Generate UUIDs to see results here.
Use in code
Generate UUIDs with built-in APIs when available; use established libraries where native support is limited.
Generate UUID using Web Crypto
TypeScriptPrimary API
crypto.randomUUID()
Creates an RFC-compatible v4 UUID in modern browsers and Node runtimes.
Built-in APILibrary: Web Crypto API
const id = crypto.randomUUID();
console.log(id);Reference: Web Crypto API documentation
How to use
- Choose how many UUIDs you need.
- Generate and copy the values.
- Paste into test data, configs, or migration scripts.
Use cases
- Create unique IDs for local testing datasets.
- Generate temporary identifiers for mock API responses.
- Seed IDs for prototypes before backend integration.
Limitations and caveats
- Supported versions are limited to v4 and v7 in this tool.
- Generated IDs are random identifiers, not secure secrets.
History
- UUIDs originated in distributed systems to generate unique identifiers without central coordination.
- The specification matured through RFC 4122 and later updates, becoming common across databases and APIs.
- UUID v4 became especially popular because it is simple to generate and practical for many application IDs.
Source: RFC 9562: Universally Unique IDentifiers (UUIDs) · MDN: Crypto.randomUUID
Evolution and improvements
- ID generation moved from server-only utilities to client-side and browser-safe workflows.
- Modern platforms include native UUID APIs, making generation faster and more consistent.
- Teams increasingly use UUIDs with domain-specific prefixes or metadata wrappers for observability.
Source: RFC 9562: Universally Unique IDentifiers (UUIDs) · MDN: Crypto.randomUUID