JWT Decoder
Developer ToolsDecode & inspect JWT tokens
About JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, claims, and expiration status without any server calls.
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Frequently Asked Questions
What is a JWT token and what are its three parts?
A JSON Web Token (JWT) is a compact token format for transmitting authenticated data between services. It has three Base64url-encoded parts separated by dots: a header specifying the signing algorithm, a payload containing claims like user ID and expiration, and a cryptographic signature for verification.
How do I decode and read a JWT token online?
Paste your JWT string into the input field and the tool instantly decodes all three sections. The header and payload are displayed as formatted JSON with human-readable labels for standard claims like expiration time and issuer. No secret key is needed for decoding.
Does this tool verify JWT signatures?
This tool decodes and displays JWT contents but does not verify the cryptographic signature. Signature verification requires the secret key or public key, which should never be shared with online tools. Use this tool for inspecting token structure and debugging claims.
Is my JWT token data safe when decoded here?
Yes. All decoding happens entirely in your browser using standard Base64url parsing. Your token is never sent to any server. This makes it safe for inspecting tokens that contain user IDs, roles, permissions, and other sensitive claim data.
What standard JWT claims does this decoder recognize?
The tool labels all registered claims: iss (issuer), sub (subject), aud (audience), exp (expiration time), nbf (not before), iat (issued at), and jti (JWT ID). It also shows whether the token is expired, how long until expiration, and displays any custom claims in the payload.
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