Blog

Learn about UUIDs, GUIDs, and when to use them in your applications.

• UUID vs GUID — What's the Difference?

  Explains the naming and technical overlap between UUID and GUID.

• When to Use UUID v4 vs v5?

  Random vs name-based UUIDs: use cases and trade-offs.

• Why UUID Can Be a Bad Choice for Primary Key in Databases

  Index size, fragmentation, and when to prefer sequential IDs.

• UUID Generator for Python

  How to generate UUIDs in Python: built-in uuid and best practices.

• Bulk UUID Generator for Testing

  Generate thousands of UUIDs for tests, fixtures, and seed data.

• UUID v1 vs v4 vs v7 — Which Version to Choose?

  Compare time-based, random, and time-ordered UUIDs.

• What Is UUID v7 and Why Use It?

  Time-ordered UUIDs for better indexes and sorting.

• How to Validate a UUID

  Regex, tools, and API for checking UUID format and version.

• UUID in JavaScript and Node.js

  Generate and validate UUIDs with crypto.randomUUID and libraries.

• UUID in SQL — PostgreSQL, MySQL, and More

  Native types, indexes, and generating UUIDs in SQL.

• UUID vs ULID — When to Use Which?

  Format, sortability, and use cases for both.

• Storing UUIDs in Databases — Binary vs String

  Size, performance, and readability trade-offs.

• UUID Collision — Is It Possible?

  Theory, probability, and when you can ignore it.

• UUID in REST APIs — Best Practices

  Paths, headers, responses, and validation.

• Nil UUID — What Is It and When to Use It?

  The all-zeros UUID as placeholder and sentinel.