🔒 Decoded entirely in your browser. Your token is never sent to any server. Signature is not verified.
How to Use JWT Decoder
1
Paste your JWT token into the input.
2
Click Decode Token to see the header and payload.
3
Use Load Sample to see an example.
Features
✓Decodes header and payload
✓Detects token expiry and shows status
✓Client-side only — token never sent to server
✓Copy individual sections
✓Sample token included
Why Use This Tool
Debug authentication flows
Understand JWT structure for learning
Verify token claims without a backend
Safe — decoded locally in your browser
Frequently Asked Questions
Does it verify the signature?
No. This tool only decodes the visible parts of the JWT. Signature verification requires the secret key.
Is my token secure?
Yes. Decoding happens entirely in your browser. Nothing is sent to our servers.