Developers often need unique identifiers while building APIs, working with databases, creating test data or developing distributed applications.
UUID v4 is a popular choice because it is generated using random data rather than relying on a timestamp or machine identifier.
What is UUID v4?
UUID v4 is a 128-bit identifier. Out of its 128 bits, 122 bits are random, while the remaining bits identify the UUID version and variant.
Example:
550e8400-e29b-41d4-a716-446655440000
Where can UUID v4 be useful?
Application and database record identifiers
API resource IDs
Test data and development environments
Identifiers in distributed applications
File and resource naming
Generate a UUID v4 online
If you need a UUID quickly without writing code, try the UUID v4 Generator from UUIDTools.online.
👉 Generate UUID v4:
https://uuidtools.online/en/tool/uuid-v4-generator
You can use it whenever you need a random UUID for development or testing.
A quick note: UUIDs are identifiers, not passwords or authentication secrets. Use purpose-built secure tokens for sensitive authentication workflows.
What do you usually use UUID v4 for — database records, APIs, or testing?
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