Decode and inspect JSON Web Tokens to view header, payload, and claims.
JWT Token
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Why use our JWT Decoder?
Quickly decode and inspect JSON Web Tokens (JWTs) to understand their contents. View the header algorithm, payload claims, and signature. Timestamps are automatically converted to readable dates. Perfect for debugging authentication issues, understanding API tokens, or learning about JWT structure.
Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: header, payload, and signature.
Is my token secure when using this tool?
Yes! All decoding happens entirely in your browser. Your token is never sent to any server or stored anywhere.
Can this tool verify signatures?
This tool decodes tokens but does not verify signatures, as that requires the secret key which should remain private.
What do the common claims mean?
Common claims include: 'sub' (subject), 'iat' (issued at), 'exp' (expiration), 'iss' (issuer), and 'aud' (audience).
Why are some timestamps shown as dates?
Standard JWT timestamp claims like 'iat', 'exp', and 'nbf' are automatically converted from Unix timestamps to readable dates.