Paste a JWT token above to decode it instantly
About JWT Decoder
JWT Decoder is a client-side utility that decodes JSON Web Tokens (JWTs) without a backend. It parses the three base64-encoded segments (Header, Payload, and Signature) and displays them as formatted JSON objects, indicating expiry and validation parameters.
How to Use JWT Decoder
- Paste your encoded JWT (typically starting with eyJ...) into the input box.
- The header, payload claims, and signature information decode automatically in real-time.
- Inspect claim properties like exp (expiration), sub (subject), and iat (issued at) to verify auth details.
Frequently Asked Questions
Is it safe to decode my JWT here?
Yes. The decoder runs completely on the client side. Your JWT is never sent to any server, keeping security keys and session payloads secure.
What are the three parts of a JWT?
A JWT is split by dots (.) into: Header (contains algorithm and token type), Payload (contains user claims and metadata), and Signature (verifies integrity).
Can I verify the signature here?
This utility displays the signature data and validates token structure. Since verification requires the secret key, make sure you never paste production secrets anywhere.