Four Practical Ways to Generate UUIDs: How to Pick the Right One

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Engineers routinely need unique identifiers for database rows, session tokens, and event IDs, and there are four common approaches to generating them: manual copy-paste, spreadsheets, scripts, and purpose-built web tools. Manual creation is quick for one-off demos but risks duplicates and unknown UUID versions beyond a handful of values. Spreadsheets offer fast bulk generation but can silently rewrite values when sorted and lack flexibility to switch between UUID versions. Scripting languages like Node, Python, Go, and Java provide cryptographically strong, reproducible UUIDs and are best suited for migrations, seed scripts, and CI pipelines. The right method depends on scale and context, guided by RFC 4122, which defines the version and variant bits that make a UUID truly unique.

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