UUID Generator
UUID Generator
How to Use the UUID Generator:
Select a UUID version (v1 for time-based, v4 for random, or v5 for namespace-based). Choose your output format (standard, braces, or hex). For v5 UUIDs, provide a namespace (DNS, URL, OID, X.500, or custom UUID) and a name. Click Generate to create UUIDs, or use Batch Generate to create multiple at once.
- WordPress Development
Generate unique identifiers for custom post types, user IDs, and database records that need globally unique values.
- API Development
Create unique API keys, request IDs, and transaction identifiers for REST API endpoints and web services.
- Database Records
Generate UUIDs for database primary keys when you need globally unique identifiers across distributed systems.
How Do UUIDs Work?
UUIDs (Universally Unique Identifiers) are 128-bit identifiers that are guaranteed to be unique across time and space. Different versions use different generation methods: v1 uses MAC address and timestamp, v4 uses random numbers, and v5 uses namespace-based hashing.
- UUID v1 (Time-based)Combines MAC address and timestamp to create time-ordered UUIDs. Useful when you need chronological ordering of identifiers.
- UUID v4 (Random)Uses cryptographically random numbers to generate UUIDs. Most common version for general-purpose unique identifiers.
- UUID v5 (Namespace-based)Generates deterministic UUIDs from a namespace UUID and a name using SHA-1 hashing. Same input always produces the same UUID.
Using UUIDs in JavaScript:
function generateUUID() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
const r = Math.random() * 16 | 0;
const v = c === 'x' ? r : (r & 0x3 | 0x8);
return v.toString(16);
});
}
const uuid = generateUUID();
console.log(uuid);550e8400-e29b-41d4-a716-446655440000Collect Better Feedback with Userback
Frequently Asked Questions
What is the difference between UUID v1, v4, and v5?
v1 uses MAC address and timestamp (time-ordered), v4 uses random numbers (most common), and v5 uses namespace-based hashing (deterministic).
When should I use UUID v5?
Use v5 when you need deterministic UUIDs – the same namespace and name will always produce the same UUID, useful for generating consistent identifiers from known inputs.
What format should I use?
Standard format (with hyphens) is most common. Braces format includes curly braces, and hex format removes hyphens entirely.
