JWT Decoder & Inspector
Decode and inspect JSON Web Tokens (JWT). View header, payload, and verify token structure instantly.
How to Use
Paste Your JWT
Copy your JWT token and paste it in the input field above.
Decode
Click "Decode JWT" to parse and display the token's header, payload, and signature.
Analyze
Review the decoded claims. Time-based claims (exp, iat, nbf) are automatically converted to readable dates.
FAQ
What is a JWT?
JSON Web Token (JWT) is a compact, URL-safe way to represent claims between two parties. It consists of three parts: Header, Payload, and Signature, separated by dots.
What are common JWT claims?
iss (issuer), sub (subject), aud (audience), exp (expiration time), iat (issued at), nbf (not before). You can also add custom claims.
Does this verify the signature?
This tool decodes and displays the JWT but does not verify the signature. Signature verification requires the secret key, which should never be shared publicly.
Is my token secure?
Yes. All decoding happens in your browser. Your token never leaves your device.