UUID Generator
Generate unique identifiers (UUIDs) in different versions and formats for development, testing, and database applications
How to Use the UUID Generator
1. Set Parameters: Choose the number of UUIDs (1-100), version, and output format
2. Configure v5 (if selected): For UUID v5, provide a namespace and name
3. Generate: Click the generate button to create UUIDs
4. Copy UUIDs: Click the copy button next to any UUID or use "Copy All" for multiple UUIDs
5. Use UUIDs: Use the generated UUIDs in your applications, databases, or APIs
UUID Versions
UUID v1: Time-based with MAC address (includes timestamp information)
UUID v4: Random UUID (most commonly used, cryptographically random)
UUID v5: Namespace-based with SHA-1 (deterministic, same input = same UUID)
Output Formats
• Standard: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (most common)
• No Hyphens: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx (compact format)
• Uppercase: XXXXXXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX (uppercase letters)
• Braces: {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} (wrapped in braces)
• URN: urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (URN format)
Predefined Namespaces (UUID v5)
• DNS: 6ba7b810-9dad-11d1-80b4-00c04fd430c8 (for domain names)
• URL: 6ba7b811-9dad-11d1-80b4-00c04fd430c8 (for URLs)
• OID: 6ba7b812-9dad-11d1-80b4-00c04fd430c8 (for object identifiers)
• X.500: 6ba7b814-9dad-11d1-80b4-00c04fd430c8 (for X.500 distinguished names)
Common Use Cases
• Database Primary Keys: Use UUIDs as unique identifiers in databases
• API Endpoints: Generate unique resource identifiers for REST APIs
• Session Management: Create unique session identifiers
• File Naming: Generate unique filenames to avoid conflicts
• Distributed Systems: Create globally unique identifiers across systems
• Testing: Generate test data with unique identifiers
• Microservices: Create correlation IDs for request tracing
UUID Structure
Format: 8-4-4-4-12 hexadecimal digits (128 bits total)
Version: Indicated in the 13th character (version field)
Variant: Indicated in the 17th character (variant field)
Uniqueness: UUIDs are designed to be globally unique across time and space
Collision Resistance: The probability of generating duplicate UUIDs is extremely low
Best Practices
• Use v4 for most cases: Random UUIDs are suitable for most applications
• Use v1 for time-based needs: When you need to sort by creation time
• Use v5 for deterministic IDs: When you need the same UUID for the same input
• Store as strings: UUIDs are typically stored as string/text in databases
• Consider performance: UUIDs are larger than auto-incrementing integers
• Index efficiently: Consider using UUID v1 for better database performance
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