A web tool to generate and decode common identifier formats in one interface.

The app is built with React + Vite and optimized for large batches using a Web Worker and virtualized lists.

• Batch generation for multiple identifier types:
  • UUID v1, v3, v4, v5, v6, v7
  • UUID nil, max
  • ULID, NanoID, CUID2, Snowflake
• Output formatting options for generated values:
  • uppercase
  • with/without hyphens
  • with braces
• Namespace support for UUID v3/v5 (dns, url, oid, x500, custom)
• Batch decoding from text, CSV, and JSON (paste input or upload file)
• Embedded timestamp parsing for supported formats (time-based UUIDs, ULID, Snowflake)
• Export results to .txt and .csv
• Share decode input through URL hash
• Responsive UI with Light/Dark/System themes
• PWA support via vite-plugin-pwa

• React 19 + TypeScript
• Vite 6
• Tailwind CSS 4
• Zustand (state management)
• @tanstack/react-virtual (virtualization)
• Web Worker for batch generation

• Node.js 18+ (Node.js 20+ recommended)
• npm 9+

npm install
npm run dev

By default, the app runs at http://localhost:3000.

For production SEO files, set VITE_SITE_URL in .env (see .env.example).

• npm run dev: start development server (--host 0.0.0.0, port 3000)
• npm run seo:files: generate public/sitemap.xml and public/robots.txt from VITE_SITE_URL
• npm run build: build for production
• npm run preview: preview production build locally
• npm run lint: type-check (tsc --noEmit)
• npm run clean: remove build artifacts (dist)

src/
  components/      # Main UI: Generator, Decoder, Guide...
  workers/         # uuid-worker.ts (batch generation)
  lib/             # parser/utilities
  store/           # Zustand store
  data/            # version descriptions and metadata
docs/
  README.md
  FEATURES.md
  ARCHITECTURE.md

• Docs overview
• Features
• Architecture