JWT Claims Decoder (Read Only)
Read-only JWT decoder to parse and inspect claims offline with zero signature verification and complete in-browser privacy.
- Free
- No signup
- Runs in your browser — nothing is uploaded
Browser onlyYour data never leaves this device.
The token is decoded by your browser, in memory, and shown to you. It is never uploaded, never sent to any provider, never written to storage and never kept after you clear it or close the tab. This page makes no network request at all.
Details: Privacy policy
Token
Pasted into this page only. The token is decoded in your browser; no request is made and nothing is stored.
Result
No token yet.
Paste a token to read its header, payload and claims. Decoding is not verification, and the page will remind you of that with the result.
JWT Claims Decoder (Read Only) reads a JSON Web Token the way a debugger reads a stack trace: it shows you what is inside, on your own machine, without performing cryptographic signature verification. Paste a token and the page splits the three segments, base64url-decodes the header and the payload, parses both as JSON, and lays the claims out with the registered ones first — issuer, subject, audience, expiry, not-before, issued-at and the token id — then everything else in the order the payload carries it. Time claims are formatted as dates and compared with your own clock, so you can see whether a verifier would consider the token current, with the wording careful to say that nothing here enforced it. The signature segment is displayed exactly as written and is neither decoded nor checked, because this tool is strictly a read-only claims viewer, not a cryptographic verifier. An encrypted token is refused outright: its payload is ciphertext, so there is nothing honest to show. Above the result, and again in the page's own limitations, is the warning that matters most: decoding is not verification, so a decoded payload is evidence of what someone typed, never of who they are. The token never leaves your browser, no request is made, and nothing is stored. Claim names are printed exactly as the issuer spelled them, including the private ones a vendor invented, because a renamed claim is a different claim. A long token wraps instead of overflowing the box, and the copied header and payload arrive as formatted JSON, ready to paste into a diff or an issue.
How to use JWT Claims Decoder (Read Only)
- Paste one token; it is decoded in your browser and never sent anywhere.
- Read the header, the claims and the warnings — including whether the token is unsigned or declares alg none.
- Treat every value as a claim the token carries, never as a verified fact about the user.
When to use JWT Claims Decoder (Read Only)
- Inspect a token you were just issued during an integration to confirm the claims your identity provider actually set.
- Debug a broken expiry by reading the exp and iat claims as dates beside your own clock, without pasting the token into a third-party site.
- Check whether a token carries the audience or role claim your API is rejecting, and see the alg value it was signed with.
Frequently asked questions about JWT Claims Decoder (Read Only)
Is my token safe to paste here?
Nothing is uploaded, stored or transmitted: the decode happens in your browser with no request of any kind, which you can confirm in your own network panel. That said, a token is a credential while it is valid, so treat any page you paste one into with care, including this one.
Does it verify the signature?
No, deliberately. Verification needs the key or the issuer's public key set and a crypto implementation, and doing it halfway is worse than not doing it. This page reads the claims; a library in your application verifies them.
Why does a token with exp in the past still decode?
Because decoding and enforcing are different things. The claim is printed as a date and compared with your clock so you can see what a verifier would do with it, but an expired token is still a readable token, and this page never refuses one for that reason.
Why is a token with alg none dangerous?
Because it carries no signature at all: the payload is whatever the sender typed. If a service accepts such a token, anyone can mint one claiming any identity. This page flags it clearly rather than quietly displaying the payload.
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