UUIDv4 vs UUIDv7: choose randomness or time order
Compare UUIDv4 random identifiers with UUIDv7 time-ordered identifiers using their exact RFC 9562 fields and operational trade-offs.
ReadRFC 9562 in practice
UUID field guides without hidden assumptions
Understand UUIDv4, UUIDv7, canonical text and security boundaries before choosing or validating an identifier.
UUID anatomy: format, version, variant and strict validation
Read the five hexadecimal groups of canonical UUID text and distinguish syntax checks from RFC field validation.
ReadA UUID is an identifier, not a secret or access control
Understand why random-looking UUID text must not replace passwords, access tokens, authorization or record checks.
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