Best Online JWT Decoder
Decode, debug, and inspect JSON Web Tokens instantly. Client-side processing ensures your tokens never leave your browser.
// Header will appear here...
// Payload will appear here...
Why use this JWT Decoder?
Secure & Client-Side
We prioritize your privacy. All decoding happens locally in your browser. No data is sent to any server.
Instant Decoding
Decode JWT tokens in real-time as you type. View header and payload separately with syntax highlighting.
Easy to Use
Simply paste your JWT token and see the decoded header and payload immediately. No verification needed.
Developer Friendly
Perfect for debugging authentication flows, inspecting token claims, and understanding JWT structure.
Frequently Asked Questions
What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts: header, payload, and signature.
Is my token safe?
Yes! We do not store or transmit your tokens. Everything is decoded locally on your device using JavaScript in your browser.
Does this verify the token signature?
No, this tool only decodes the token to show its contents. It does not verify the signature. For signature verification, you need the secret key and should use proper JWT libraries.