Core Developer Utilities
Essential micro-tools for software engineering workflows. Decode JWT claims, generate cryptographically secure UUIDs, parse Unix epoch timestamps, and test regular expressions safely.
Core Micro-Utilities (13)
Generate random RFC 4122 v4 UUIDs individually or in bulk.
Validate UUID syntax and determine version and variant compliance.
Convert between Unix timestamps and ISO 8601 UTC / Local dates.
Decode JSON Web Tokens to inspect Header, Payload claims, and expiration.
Generate SHA-256, SHA-384, SHA-512, and SHA-1 hashes.
Test regular expressions with match indices, flags, and capture groups in a Web Worker.
Build and explain 5-field Unix cron schedule expressions in plain English.
Convert colors between HEX, RGB(a), HSL(a), and CMYK formats.
Count words, characters, sentences, paragraphs, and reading time in real-time.
Convert text between camelCase, PascalCase, snake_case, kebab-case, and UPPERCASE.
Deduplicate list items and lines preserving original line ordering.
Sort text lines alphabetically, numerically, in reverse, or by length.
Compare two text blocks line-by-line and highlight additions and deletions.
Utility Technical Guides & Tutorials
How to Decode & Inspect JWT Tokens Safely
Comprehensive guide to JSON Web Tokens (JWT). Learn how to decode JWT headers and payloads, check token expiration (exp), inspect claim scopes, and verify signatures.
How Unix Timestamps Work: Seconds, Milliseconds & Y2038
Learn everything about Unix timestamps (Epoch time). Understand seconds vs milliseconds, UTC conversion formulas, ISO 8601 formatting, and the 32-bit Year 2038 problem.
Cron Expression Examples & 5-Field Reference Guide
Complete cron expression reference guide with 20+ copy-paste examples. Learn standard 5-field Unix crontab syntax, special characters (*, /, -, ,), and timezone handling.
Regex Testing & Optimization Guide for Developers
Comprehensive guide to testing regular expressions in JavaScript. Learn character classes, flags (g, i, m, s, u), capture groups, lookaheads, and how to avoid catastrophic backtracking.