Decode and inspect JSON Web Tokens (JWT) instantly. View header and payload data in a readable format.
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.
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.
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.
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.
Yes, you can decode expired tokens. Decoding only shows the token's contents and doesn't check its validity.
Yes, decoding is performed entirely in your browser. Your tokens never leave your device.