JWT Decoder
Decode and inspect JWT tokens with header, payload, and signature details.
What does JWT Decoder do?
JWT Decoder parses JSON Web Tokens and displays the header, payload, and signature in a readable format. It validates the token structure and shows all claims.
Use Cases
- •Debug authentication issues by inspecting JWT claims
- •Verify token contents before sending to an API
- •Understand JWT structure for learning purposes
- •Check token expiration and other time-based claims
How to Use
- 1Copy a JWT token from your application or API response
- 2Paste it into the input field
- 3Click "Decode" to parse the token
- 4View the header, payload, and signature separately
Frequently Asked Questions
Does this tool verify JWT signatures?
No, this tool only decodes and displays JWT contents. It does not verify the cryptographic signature.
Is my JWT data safe?
Yes. All decoding happens in your browser. Your token is never sent to any server.