Learn about UUIDs, GUIDs, and when to use them in your applications.
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UUID vs GUID — What's the Difference?
Explains the naming and technical overlap between UUID and GUID.
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When to Use UUID v4 vs v5?
Random vs name-based UUIDs: use cases and trade-offs.
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Why UUID Can Be a Bad Choice for Primary Key in Databases
Index size, fragmentation, and when to prefer sequential IDs.
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UUID Generator for Python
How to generate UUIDs in Python: built-in uuid and best practices.
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Bulk UUID Generator for Testing
Generate thousands of UUIDs for tests, fixtures, and seed data.
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UUID v1 vs v4 vs v7 — Which Version to Choose?
Compare time-based, random, and time-ordered UUIDs.
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What Is UUID v7 and Why Use It?
Time-ordered UUIDs for better indexes and sorting.
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How to Validate a UUID
Regex, tools, and API for checking UUID format and version.
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UUID in JavaScript and Node.js
Generate and validate UUIDs with crypto.randomUUID and libraries.
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UUID in SQL — PostgreSQL, MySQL, and More
Native types, indexes, and generating UUIDs in SQL.
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UUID vs ULID — When to Use Which?
Format, sortability, and use cases for both.
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Storing UUIDs in Databases — Binary vs String
Size, performance, and readability trade-offs.
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UUID Collision — Is It Possible?
Theory, probability, and when you can ignore it.
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UUID in REST APIs — Best Practices
Paths, headers, responses, and validation.
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Nil UUID — What Is It and When to Use It?
The all-zeros UUID as placeholder and sentinel.