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Technical Depth: UUID V4 Architecture
Generate Version 4 random UUIDs. Most popular version for general-purpose unique identifiers and security tokens.
Version 4 UUIDs are randomly generated using cryptographically secure methods. Ideal for general purpose and security-sensitive applications. In distributed systems, the choice of identifier version significantly impacts both scalability and security. Karuvigal provides high-precision synthesis to ensure your identifiers comply with RFC 4122 and emerging IETF standards for Version 7.
Security & Entropy Considerations
For security-sensitive applications, entropy is critical. Our generator leverages crypto.getRandomValues(), providing a high degree of unpredictability. This makes our Version 4 and Version 7 UUIDs suitable for session tokens, password reset links, and other non-guessable identifier requirements.
Database Performance
Using Version 1 or Version 7 UUIDs as primary keys can dramatically improve "insert" performance in B-Tree indexed databases like PostgreSQL and MySQL. The timestamp-first structure ensures that new records are appended to the end of the index, reducing page splits and fragmentation.
Deterministic Identifiers
Versions 3 and 5 allow for "Name-based" generation. This is essential when you need to create the same UUID across different systems based on a specific input string, ensuring consistency without needing to synchronize central databases.