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Interactive JWT Decoder

Developer

Decode and inspect JWT headers and payloads locally in your browser — no data sent to any server.

ttb run jwt-decoder
JWT Token
Paste a JWT token above and press Decode or ⌘ Enter
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How to Use JWT Decoder

Paste a JSON Web Token (the long string with two dots) into the input. The tool instantly decodes and displays the Header (algorithm, type), Payload (claims, expiration, user data), and Signature in a readable, syntax-highlighted format. Expiration status is checked automatically.

1

Enter your parameters

Configure the inputs for the Jwt Decoder according to your specific needs.

2

View real-time results

The utility instantly processes your request and displays the calculated outputs directly in your browser.

3

Copy or Download

Click the copy icon next to the final output to instantly grab the result, or export it if applicable.

Frequently Asked Questions

Can anyone decode a JWT?+
Yes. The header and payload of a JWT are simply Base64-encoded, not encrypted. Anyone with the token can read its contents. The signature only guarantees the data hasn't been tampered with - it does not provide confidentiality.
What does the expiration date mean?+
The "exp" claim is a Unix timestamp indicating when the token expires. After this time, the server should reject the token. This tool automatically checks if your token is currently valid or expired.

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