JWT Decoder
Decode JWT tokens for free. Paste the token and read its header and payload as formatted JSON, with the dates (exp, iat, nbf) made readable. The tool does NOT verify the signature and runs entirely in your browser, with the token never sent to servers.
How to use
- 1Paste your JWT token into the box.
- 2Read the decoded header and payload, with readable dates.
- 3Copy the header or payload if you need it.
What it's for
- Inspect a token's claims while developing.
- Check a token's expiry date (exp).
- Debug authentication problems in an API.
- See what data a JWT is carrying.
Frequently asked questions
Is the tool free?
Yes. It's completely free with no usage limits.
Does it verify the signature?
No. This tool only decodes the header and payload. It does not validate the signature, because that requires the secret or public key.
Is my token sent to a server?
No. Decoding happens entirely in your browser. The token never leaves your device.
What kind of token does it accept?
JWT tokens encoded in Base64URL, with a JSON header and payload. It accepts tokens with or without the signature part.
Do I need an account?
No. The tool works right away, with no signup or login.