Client-Side Decoder
JWT Debugger
Decode, verify and debug JSON Web Tokens. Paste your token to view its header and payload instantly.
Encoded Token
Header
Algorithm & Token Type
{}Payload
Data & Claims
{}Signature
Verified Signature
HMACSHA256(
base64UrlEncode(header) + "." +
base64UrlEncode(payload),
your-256-bit-secret
)
base64UrlEncode(header) + "." +
base64UrlEncode(payload),
your-256-bit-secret
)
Popular Searches
Axonix JWT Debugger is a fast, privacy-first utility that runs directly in your browser. Get started in seconds: Paste your JSON Web Token (JWT) into the input field on the left.
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How to Use JWT Debugger
- 1Paste your JSON Web Token (JWT) into the input field on the left.
- 2Instantly see the decoded Header and Payload on the right.
- 3The tool will automatically validate the token structure.
- 4Header fields (like 'alg' and 'typ') are highlighted in red.
- 5Payload data (claims) is highlighted in purple.
- 6Use the Clear button to reset the tool and start over.
Key Features
- Client-Side Only: Your secure tokens are decoded right in your browser memory and are never transmitted to any server.
- Instant Parsing: See the decoded JSON structure immediately as you type or paste.
- Visual Debugging: distinct color coding helps you understand the three parts of a JWT (Header.Payload.Signature).
- Error Handling: Get clear feedback if your token is malformed or invalid.
Frequently Asked Questions
Learn More
Need practical guides, walkthroughs, and troubleshooting tips? Explore the Axonix blog for detailed tutorials.