JWT Token
Decoded Token
Header
Payload
Signature
Claims
| Claim | Value | Description |
|---|
Frequently Asked Questions
What is a JWT token?
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties, commonly used for authentication and authorization.
Is it safe to decode JWT tokens online?
Yes, JWT decoding only reads the publicly visible header and payload — no secret key is needed. Our tool runs entirely in your browser; no data is sent to any server.
What does "alg: none" mean in a JWT?
The "none" algorithm means the token has no signature verification, which is a serious security vulnerability. Never accept tokens with alg:none in production.
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