Decode a JSON Web Token to inspect its header, payload, and expiry.
CipherForces JWT Decoder splits a JSON Web Token into its three parts (header, payload, signature), base64url-decodes each, and pretty-prints the JSON with syntax highlighting. Expiration and issued-at timestamps are shown as human-readable UTC alongside a relative time ("expires in 14 minutes" / "issued 3 hours ago").
Unlike jwt.io — which is excellent but requires a network round trip to their servers — this tool runs 100% in your browser. You can paste production tokens without worrying that they'll leak into anyone's logs.
This tool does not verify the signature — that requires the issuer's public key or HMAC secret, which we don't ask for. Pasting a token into a decoder on any site is safe; pasting it into a verifier means handing over your secret. For debugging, decoding is usually all you need.
Privacy: All decoding happens in your browser. The token string is never sent to any server.
Paste your JSON Web Token into the JWT Decoder and it instantly splits the token into its three parts, then Base64URL-decodes the header and payload into readable JSON. You can inspect claims like issuer, subject, and roles right away. No signup is needed and the tool is free.
Yes. The JWT Decoder runs entirely in your browser using JavaScript, so your token is never uploaded to any server. All decoding happens locally on your device, and nothing is stored or transmitted. This keeps sensitive tokens private, which matters because a JWT can grant access to your account.
Yes. The decoder reads the standard exp claim from the payload and converts that Unix timestamp into a human-readable date and time. It also shows iat and nbf claims when present, so you can quickly check whether a token has expired or is still valid for use.
No. Decoding only reads the header and payload, which are Base64URL-encoded, not encrypted, so anyone can view their contents. Verifying the signature requires the secret or public key and confirms the token was not tampered with. Treat decoded payload data as readable but unverified.
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