What is a UUID v4?
A Universally Unique Identifier (UUID) Version 4 is a 128-bit number represented as a 36-character string containing 32 hexadecimal digits separated by four hyphens (e.g. `f47ac10b-58cc-4372-a567-0e02b2c3d479`).
Generate random UUID strings using our UUID v4 Generator Tool.
Why Use UUIDs over Auto-Increment IDs?
- Distributed Systems: Multiple microservices can generate unique IDs independently without database coordination.
- Security: Auto-increment integer IDs (`/user/1`, `/user/2`) expose database record counts to attackers, while UUIDs are unpredictable.
- Data Merging: Merging records from separate databases will not cause primary key collision errors.
Generating UUID v4 Strings
- Open the UUID v4 Generator.
- Select the quantity of UUIDs needed (1 to 50).
- Click "Generate UUID v4" and copy the unique key strings.