News, in-depth guides, and explanations about unique identifiers, their applications, and best practices.
Coola's parser fix shows why ULID validators must accept ASCII lowercase and reject values above 128 bits, even when length and alphabet look correct.
A shared entropy source in memcue could race under concurrent writes. Learn what LockedMonotonicReader fixes and where ordering guarantees end.
A Coola fix closes a duplicate-ID path after sequence exhaustion and a backward clock jump. Learn which state transitions and recovery cases to test.
Compare random and time-ordered UUIDs for database keys, privacy, and compatibility, with a practical migration checklist.
Understand UUID v4 collision probability with worked examples, the birthday calculation, and practical database safeguards.
Learn what UUIDs reveal, why public identifiers still need authorization, and how to keep resource IDs separate from access tokens.
A technical deep dive into the logic behind our UUID decoder. Learn how we parse hex strings, extract timestamps from v7 and v1, and identify variants.
Explore modern alternatives to UUIDs such as CUID (v2), KSUID, NanoID, ULID, and Snowflake ID. Compare their features, performance, and use cases.
Understand the basics of Universally Unique Identifiers (UUIDs), their structure, different versions, and how they ensure uniqueness in distributed systems.