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DevToolkit Pro

About DevToolkit Pro

Our Mission

DevToolkit Pro is a privacy-first, fully client-side developer toolkit. We believe developer tools should be fast, private, and work offline — without requiring an account, sending data to servers, or showing intrusive ads.

What Makes Us Different

  • 100% Client-Side: Every tool runs in your browser. No backend server, no API calls. Your data never leaves your device.
  • Privacy First: No tracking cookies, no personal data collection. We don't even know you're here.
  • Works Offline: Add to your home screen and use it without an internet connection (PWA support).
  • Unicode Safe: Full support for multi-byte characters, including Chinese, emoji, and other non-ASCII text.

30+ Tools, 7 Categories

  • JSON: Format, minify, validate, convert to TypeScript/Go/Java
  • API: HTTP request tester (GET/POST/PUT/DELETE/PATCH)
  • Utils: Base64, URL, JWT, Regex, UUID/NanoID/ULID, HTML Entity
  • Crypto: SHA/HMAC hash, AES-GCM encryption (Web Crypto API)
  • Code: Prettier formatter for JS/HTML/CSS/SQL
  • Tools: Color converter, password generator, timestamp, Cron, CIDR, Diff
  • Data: Markdown preview, YAML/JSON, CSV/JSON, JSONPath, JSON Schema

Built With

  • Next.js 14 (Pages Router)
  • React 18 + TypeScript (strict mode)
  • Tailwind CSS
  • Monaco Editor (VS Code's editor engine)
  • Web Crypto API (browser-native encryption)
  • 320+ unit tests for correctness

Open Source Philosophy

We believe in transparency. Our tools use well-established, audited open-source libraries (Prettier, js-yaml, ajv, etc.) for core logic. The service is free to use and will remain so.

Contact

Questions, feedback, or feature requests? Email: contact@wcytcn.com