Does this verify the signature?

No — this tool only decodes the token. It does not verify the signature, since that requires the signing secret or public key.

Is it safe to paste a real token here?

Decoding happens entirely in your browser and nothing is sent anywhere, but as a rule of thumb avoid pasting production secrets into any online tool.

Why do I see three parts?

A JWT has a header, payload and signature, separated by dots — this tool decodes the first two.

JWT Decoder

Decode a JSON Web Token to inspect its header and payload. Paste a token to see its contents and expiry status instantly, entirely in your browser.

Comment utiliser JWT Decoder

1
Paste your JWT into the input box.
2
The header and payload are decoded automatically.
3
Check the expiry status and copy either part as JSON.

Fonctionnalités de JWT Decoder

Decodes header and payload instantly.
Flags expired tokens using the exp claim.
Fully client-side — your token never leaves your browser.

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Gratuit

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