UUID Blog
UUID guides, patterns and best practices
Practical, developer-focused articles on UUID versions, database keys, identifier design and the tradeoffs behind them.
When UUID v7 Is a Strong Primary-Key Choice in 2026
Random UUID v4 keys scatter writes across an index. UUID v7 keeps global uniqueness while sorting by time, making it a strong option for many write-heavy tables.
5 UUID Mistakes That Cause Real Production Bugs
From treating an identifier as a secret to truncating bits away, here are the five UUID mistakes that most often turn into real incidents, and how to avoid each one.
How to Store UUIDs in PostgreSQL, MySQL and SQL Server
Native uuid in Postgres, BINARY(16) in MySQL, uniqueidentifier in SQL Server: how to store UUIDs efficiently in each engine, and why insert order matters.
Choosing an ID Scheme: UUID vs ULID vs Nano ID
There is no universally best identifier, only the right fit. Here is a short decision framework for choosing between UUID, ULID and Nano ID for your next system.
Put the articles into practice
Use a working example to check an ID scheme before adopting it. Start with generation, inspect the result, then choose the storage and validation rules your application needs.
UUID v7 Generator
Generate UUID v7 values for databases, logs and event streams where natural time ordering matters.
Best UUID Version for Databases
Choose between UUID v4, UUID v7, database sequences and public IDs for real application tables.
UUID vs ULID
Compare UUID and ULID for database keys and distributed IDs, including sortability, encoding, size and when UUID v7 closes the gap.
UUID vs Nano ID
Compare UUID and Nano ID for unique identifiers: length, collision safety, URL friendliness and when each is the better fit.
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