Learn About UUIDs
Whether you are new to UUIDs or looking to deepen your understanding, our guides cover everything from the basics to advanced topics like security and database design.
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What is a UUID? A Complete Guide
Learn what UUIDs are, how they work, and why they are essential in modern software development.
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UUID Versions Explained: v1, v4, v5, v7
A deep comparison of UUID versions — when to use v1, v4, v5, or v7 in your applications.
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The History of UUIDs: From Apollo to RFC 9562
Trace the evolution of UUIDs from 1980s Apollo computing through RFC 4122 to the modern RFC 9562.
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UUIDs and Security: What Developers Need to Know
Security implications of using UUIDs — predictability, information leakage, and best practices.
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Why Databases Use UUIDs as Primary Keys
Comparing UUIDs vs auto-increment integers as primary keys in PostgreSQL, MySQL, and distributed systems.
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UUIDs in PostgreSQL: The Complete Guide
Master UUID handling in PostgreSQL — native uuid type, indexing strategies, performance, and migration.
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UUID vs ULID: Which Should You Use?
A detailed comparison of UUID and ULID — storage, sortability, readability, and database performance.
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Working with UUIDs in JavaScript & Node.js
Generate, validate, and format UUIDs using crypto.randomUUID(), the uuid npm package, and Web Crypto API.
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Working with UUIDs in Python
Generate and validate UUIDs in Python using the built-in uuid module. Includes Django and SQLAlchemy examples.
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6 Common UUID Mistakes Developers Make
Avoid pitfalls like Math.random(), treating UUIDs as secrets, case-sensitive comparisons, and database misconfiguration.
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How to Use UUIDs with the Notion API
Extract and convert Notion database IDs and page IDs to proper UUID format for the Notion API.
Try Our Tools
Ready to put your knowledge into practice? Use our free tools:
- UUID Formatter — Format raw 32-character strings into standard UUIDs
- UUID Generator — Generate v1, v4, v5, and v7 UUIDs
- Notion UUID Converter — Extract UUIDs from Notion URLs