JWT Decoder

Decode and inspect JSON Web Tokens (JWT) instantly. View header and payload data in a readable format.

JWT Token

Header

Payload


Our JWT decoder helps you inspect JWT tokens by decoding the header and payload sections. Perfect for debugging authentication issues or inspecting token contents. The decoding happens entirely in your browser, ensuring your tokens stay private and secure.

Frequently Asked Questions

What does a JWT decoder do?
A JWT decoder parses the token into its three parts (header, payload, and signature) and displays the decoded contents of the header and payload in a readable format.
Do I need a secret key to decode a JWT?
No, JWT tokens can be decoded without a secret key. However, decoding doesn't verify the token's authenticity - use our JWT Verifier for that.
What information can I see in a decoded JWT?
You can see the header (which includes the algorithm used), and the payload (which contains the claims). The signature remains encoded as it's a hash.
Can I decode an expired JWT?
Yes, you can decode expired tokens. Decoding only shows the token's contents and doesn't check its validity.
Is JWT decoding secure?
Yes, decoding is performed entirely in your browser. Your tokens never leave your device.