About DevToolbox

DevToolbox is a collection of free, browser-based utility tools for developers. Every tool runs entirely in your browser — no data is sent to any server, no signup is required, and everything is free to use.

Mission

Developers frequently need quick access to simple utilities — formatting JSON, encoding Base64, decoding JWTs, testing regex patterns, or generating UUIDs. Many existing tools are cluttered with ads, require signups, or send your data to remote servers.

DevToolbox is built to be the opposite: fast, clean, private, and free. All processing happens client-side using standard Web APIs. Your data never leaves your machine.

Tools

We currently offer 10 tools covering formatting, encoding, security, generation, conversion, and testing:

• JSON Formatter
• Base64 Encode/Decode
• JWT Decoder
• Cron Builder
• Regex Tester
• UUID Generator
• Timestamp Converter
• URL Encode/Decode
• Hash Generator
• Color Converter

Tech Stack

• Framework: Next.js (App Router)
• Language: TypeScript
• Styling: Tailwind CSS + shadcn/ui
• Hosting: Vercel
• Processing: 100% client-side (Web Crypto API, native JS APIs)

Operator

Contact

For feedback, bug reports, or feature requests, please reach out via X (@web_ya_san).