Decode JWT header and payload claims locally. Signature verification is not performed.
Paste a JWT to decode it.
Tool introduction
The JWT Decoder reads the visible parts of a JSON Web Token: the header and payload. It also helps explain common timing claims such as iat, exp, and nbf.
Decoding is helpful for debugging authentication, but it is not the same as verifying a token signature. A decoded token can still be fake, expired, or invalid.
Privacy and processing
Never paste production secrets or signing keys into any decoder.
Remember that decoding does not prove the token is trusted.
Check token expiry in the same timezone context as your server logs.
Use backend verification for real security decisions.
Mask sensitive claim values before sharing screenshots.
No. Decoding only reads the token content. Signature verification must happen with the correct secret or public key on the backend.
Yes. If the token has an exp claim, the decoder can help you understand the expiry time.
Be careful. A JWT can contain sensitive claims or grant access if still valid. Avoid sharing production tokens.
The header describes token metadata such as algorithm. The payload contains claims such as subject, roles, and timing.
It helps diagnose token content, but the actual fix may be in auth config, backend signing, guards, or frontend storage.
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