🔑 JWT Decoder

Decode and inspect JSON Web Tokens (JWT) instantly. Paste your token to see header, payload, and signature — no online tools, no data leaks.

🚀 Features

• Instant Decode — Paste JWT, see results immediately
• Header & Payload — View decoded JSON with syntax highlighting
• Signature Display — See raw signature in Base64
• Expiration Check — Visual indicator if token is expired
• Copy Decoded — One-click copy for header and payload
• No Server — Runs entirely in browser, zero data sent anywhere

🎯 Why This?

Most JWT decoders are online tools that send your tokens to third-party servers. Your tokens contain sensitive auth data — they shouldn't leave your machine.

This decoder runs 100% in your browser. Nothing is sent anywhere.

🛠 Tech Stack

• Next.js 14
• React
• Tailwind CSS
• shadcn/ui components
• jose (JWT library)

📦 Setup

git clone https://github.com/thehaardik/jwt-decoder.git
cd jwt-decoder
npm install
npm run dev

Open http://localhost:3000

📋 How It Works

1. Paste your JWT token
2. View decoded header (algorithm, type)
3. View decoded payload (claims, expiry)
4. Check signature status

🔐 Security

• Zero network requests
• No data logging
• Runs locally by default
• Open source

📄 License

MIT

👨‍💻 Author

Built by Haardik Miglani