Security & Identity
JWT Decoder
JWT Decoder online tool for locally decoding header and payload, inspecting claims, and checking expiration during auth debugging.
About this tool
JWT Decoder helps you inspect a token header, payload, and expiration timestamp directly in the browser so auth claims stay easy to review during debugging.
This page focuses on local decoding and readable output. It does not verify the signature and does not mint or re-sign tokens, which keeps the workflow aligned with quick inspection tasks.
Best use cases
- Inspect JWTs from login or API flows and verify claims such as issuer, subject, audience, role, or custom fields.
- Check `exp` and related time-based claims while debugging auth failures, expired sessions, or mismatched environments.
- Review token contents locally in the browser instead of pasting staging credentials into third-party sites.
How to use it
- Paste the full JWT string, usually in `header.payload.signature` format.
- Click `Decode JWT` to inspect the formatted header, payload, and expiration field.
- Copy the decoded result or continue into JSON, Base64, or hash tools for the next debugging step.
FAQ
Does JWT Decoder upload my token?
Unless the page explicitly says a network request is required, the decoding flow runs locally in your browser.
Does JWT Decoder verify signatures?
No. This tool is for decoding and readable inspection only. It does not validate signatures or issue new JWTs.
When should I use JWT Decoder?
Use it when you need to inspect claims, confirm payload content, or check whether a token has expired during auth debugging.