JWT Decoder & Validator
Decode, inspect, and validate JSON Web Tokens in your browser. No data ever leaves your device.
Paste a JWT above to decode it
Your JWTs are decoded locally in your browser. Nothing is ever sent to any server.
JWT Decoding FAQ
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and authorization. It consists of a header, payload, and signature separated by dots.
Is my token safe here?
Yes — this tool runs entirely in your browser. Your JWT is never transmitted to any server. All decoding happens locally using JavaScript.
What parts does a JWT have?
A JWT has three parts: the Header (algorithm and token type), the Payload (claims like user ID, expiration), and the Signature (verification hash). Each part is Base64URL-encoded.
What are JWT claims?
Claims are key-value pairs in the payload. Standard claims include: iss (issuer), sub (subject), aud (audience), exp (expiration), iat (issued at), nbf (not before), and jti (unique ID).
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