Showing 19-27 of 73

• tech · 2026-08-07

  What is a UUID? Universally unique identifiers explained

  Learn what UUIDs are, how the 8-4-4-4-12 format works, and when apps use them - then generate v4 UUIDs locally.

• tech · 2026-08-07

  How to generate UUID v4 online for free

  Create one or many random UUID v4 values in your browser with one-click copy. Free and private.

• tech · 2026-08-07

  UUID v4 vs v1: which should you use?

  Compare random UUID v4 with time-based v1. Prefer v4 for most new IDs unless you need time ordering.

• tech · 2026-08-07

  What is a regular expression (regex)?

  Learn how regex patterns match text, when developers use them, and how JavaScript flavor differs - then test patterns locally.

• tech · 2026-08-07

  How to test regex online for free

  Debug JavaScript regular expressions with live matches, flags, and capture groups in your browser - nothing uploaded.

• tech · 2026-08-07

  Common regex mistakes and how to fix them

  Fix missing global flag, greedy quantifiers, unescaped characters, and flavor mismatches. Test patterns privately.

• tech · 2026-08-07

  What is a Unix timestamp (epoch time)?

  Learn how Unix time counts seconds since 1970-01-01 UTC, where APIs use it, and how to convert dates privately.

• tech · 2026-08-07

  How to convert a Unix timestamp to a date (and back)

  Convert epoch seconds or milliseconds to ISO/UTC/local dates, or pick a date to get Unix time - free in your browser.

• tech · 2026-08-07

  Unix seconds vs milliseconds: how to tell them apart

  10-digit vs 13-digit epochs, JWT exp claims, and fixing dates that look decades wrong. Convert locally with Jigglify.