JWT Decoder
Decode any JWT token in your browser — free, instant, private. Read the header and payload, check when it expires, and see the algorithm. No signup, no upload.
Honest note: this tool decodes a token — it does not verify its signature. A decoded token only shows what the token claims; never trust a token in your own app without verifying its signature server-side.
Your result will appear here
Decoded token
Header
Payload
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How to use
- Paste your JWT token into the box above.
- Click Decode JWT.
- Read the header, payload and expiry — remember the signature is not verified here.
Frequently asked questions
Is my token sent to a server?
No. Decoding runs entirely in your browser — but remember, a JWT is only base64 text, so anyone holding the token can read it. Never paste a real production token into any website, including this one; use a test token.
Why is the signature not verified?
Verifying a signature needs the secret or public key, which this tool never asks for. Decoding only shows the claims inside the token.
What does 'expired' mean here?
The payload's exp claim is a Unix timestamp. If it is in the past, the token is expired and should no longer be accepted.
What is the difference between header and payload?
The header says how the token was signed (algorithm and type). The payload carries the claims — user id, name, roles, issued-at and expiry times.