JWT Decoder
Decode and inspect JWT token header, payload, and signature. Detects expiry.
Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, signed token used for authentication and authorization, containing a header, payload and signature.
Does the decoder verify the signature?
It decodes and displays the header, payload and signature, and detects expiry. Signature verification requires the secret key.
Is my token sent anywhere?
No — decoding happens entirely in your browser. Your token stays private.