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JWT Decoder
Decode and inspect JWT tokens online. View header, payload, and signature claims. Validate token structure and expiration.
Examples:
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Valid JWT structure
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Header
Payload
Claims
Signature
⚠️ Signature verification requires the secret key and is not performed client-side.
Popular Tools
About JWT Decoder
Decode and inspect JWT (JSON Web Tokens). View header, payload, and signature. Essential for debugging authentication and API development.
Use Cases
Debugging authentication issues
Inspecting token contents
Verifying token structure
Learning about JWTs
API development and testing
How to use
1
Paste a JWT token
2
View decoded header and payload
3
Check expiration time
4
Verify signature if key provided
Pro Tips
- JWTs have 3 parts: header.payload.signature
- Payload is NOT encrypted, only signed
- Check exp claim for expiration
Frequently Asked Questions
JSON Web Token - a compact, self-contained way to transmit claims securely.
No! JWT is signed, not encrypted. Don't put secrets in it.
Use the secret key or public key to verify the signature.