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JWT Debugger
Decode and inspect JSON Web Tokens (JWT). View header, payload, and check expiration - all client-side.
No uploads • Client-side only • Your data stays on your device
💡 What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: Header (algorithm), Payload (data), and Signature (verification).
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All processing happens directly in your browser using JavaScript. Your files, passwords, and data never leave your device and are never uploaded to our servers. We cannot see, store, or access anything you process with this tool.
No account required • No tracking • No data collection • Works offline after initial load