You need to check token expiry during login or session debugging.
Security
JWT Decoder
Inspect token headers and payloads locally, with lightweight expiry and algorithm warnings to keep debugging safe.
Header.Payload.Signature
AnalysisToken metadata
Header
Payload
Signature
Privacy note
This tool decodes tokens in the browser only. Signature verification still requires the original signing secret or public key.
Use this tool when
These are the practical situations where this workflow usually earns its keep.
You want to inspect issuer, audience, subject, or custom claims quickly.
You are reviewing whether a token uses an unsafe or unexpected algorithm.
Login troubleshooting
When a user cannot access a route, decoded claims often reveal whether the wrong audience, tenant, or role was issued.
Session expiry review
Support and QA teams can check whether tokens are expiring too early or living too long without needing backend access.
Security spot checks
Local decoding helps teams inspect token metadata without forwarding raw tokens through extra services.
Frontend and API handoff
When frontend and backend teams disagree about whether a token should work, decoding the claims gives both sides a faster shared surface for checking issuer, audience, and expiry assumptions.
Common mistakes to avoid
These are the checks that usually keep the output useful instead of misleading.
Assuming decode means verify. A decoder shows claims, but it does not prove the token was signed by a trusted issuer.
Ignoring time zones when reading expiry values in incident reviews.
Copying live tokens into shared docs without first masking or shortening them.
Learn how to use this tool
Decode token headers and claims locally so expiry issues, risky algorithms, and missing fields are easier to inspect.
Read the guideTell us what is missing
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