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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
ℹ️ 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
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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.