JWT decoder
Decode JWT tokens and see the header, the payload and the issued-at and expiry dates in readable form.
Paste the JWT token.
Header
Payload
Available in: 
JWT decoder: what it is for
The tool reads JWT tokens and shows the formatted header and payload, with the issued-at and expiry dates converted and a warning if the token has already expired.
It accepts the token with or without the Bearer prefix. Decoding happens in the browser; the signature is not verified.
How to use
- Paste the JWT token.
- See the header, payload and dates.
- Copy the payload if you need it.
When to use it
- Debugging API authentication.
- Checking token permissions and expiry.
- Understanding what is inside a JWT.
Frequently asked questions
Is the token sent to a server?
No. Decoding happens in your browser, so the token never leaves your computer.
Does the tool verify the signature?
No. It only reads the content (which is just Base64URL). Verifying the signature requires the secret key or the public key of whoever issued the token.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.