Developer Tools
JWT Decoder
Decode and analyze JWT tokens
JWT Token Processing
JWT Token
Secret Key (Optional - for signature verification)
Decoded JWT
How to Use JWT Decoder
1.
Paste JWT Token
Paste your JWT token in the input field above
2.
Add Secret (Optional)
Enter secret key to verify the token signature
3.
View Results
View decoded header, payload, and signature verification
JWT Decoder Features
Complete Decoding
Decode header, payload, and signature components
Real-time Processing
Instant decoding as you type or paste tokens
Signature Verification
Verify token signatures with HMAC algorithms
Frequently Asked Questions
Q: What is a JWT token?
A: JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts: header, payload, and signature.
Q: Is it safe to decode JWTs here?
A: Yes! All JWT decoding happens locally in your browser. Your tokens never leave your device, ensuring complete privacy and security.
Q: Why do I need a secret key?
A: The secret key is only needed if you want to verify the token's signature. Without it, you can still decode and view the header and payload.
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JWT Decoder
Decode and analyze JWT tokens
JWT Token Processing
JWT Token
Secret Key (Optional - for signature verification)
Decoded JWT
How to Use JWT Decoder
1.
Paste JWT Token
Paste your JWT token in the input field above
2.
Add Secret (Optional)
Enter secret key to verify the token signature
3.
View Results
View decoded header, payload, and signature verification
JWT Decoder Features
Complete Decoding
Decode header, payload, and signature components
Real-time Processing
Instant decoding as you type or paste tokens
Signature Verification
Verify token signatures with HMAC algorithms
Frequently Asked Questions
Q: What is a JWT token?
A: JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts: header, payload, and signature.
Q: Is it safe to decode JWTs here?
A: Yes! All JWT decoding happens locally in your browser. Your tokens never leave your device, ensuring complete privacy and security.
Q: Why do I need a secret key?
A: The secret key is only needed if you want to verify the token's signature. Without it, you can still decode and view the header and payload.
About JWT Decoder
Decode any JSON Web Token (JWT) to inspect its header and payload claims without needing a secret. Useful for debugging authentication issues, verifying token contents, and understanding JWT structure during development.
Key Features
- Decodes header and payload of any JWT
- Shows all claims including exp, iat, and custom claims
- Highlights token expiration status
- Formats JSON payload for readability
- Fully client-side — tokens never leave your browser
How to Use
- Paste your JWT token (the full Bearer token string) into the input
- The header and payload are decoded and displayed automatically
- Review the claims including expiration time and user data
- Check the signature section to understand the algorithm used
Frequently Asked Questions
Is it safe to paste my JWT token here?
JWT decoding is safe in this tool because everything runs in your browser. However, treat tokens like passwords — do not paste production tokens containing sensitive user data into public tools.
Can this tool verify JWT signatures?
JWT signature verification requires the secret key. This tool decodes the header and payload without verification — useful for inspecting content, not for security validation.
What is a JWT token?
A JSON Web Token (JWT) is a compact, URL-safe token format consisting of three Base64-encoded parts: header (algorithm), payload (claims), and signature. Widely used for authentication.
Why does my JWT show "expired"?
The "exp" claim contains a Unix timestamp. If the current time is past that timestamp, the token is expired. Use the Timestamp Converter to convert the value to a readable date.