JWT Decoder
Read the header and payload of a JSON Web Token.
How to use the JWT Decoder
- Paste the token
The eyJ… string (a "Bearer " prefix is fine).
- Read it
The header and payload as formatted JSON, with dates explained.
- Check the signature
Add the secret to verify HS256, HS384 or HS512 tokens.
Questions
Is it really free, with no sign-up?
Yes, completely. There's no sign-up, no login and no daily limit: just open the page and start. It works in your browser on any computer, phone or tablet with nothing to install, and your files are never uploaded — everything happens on your device.
Is it safe to paste a token here?
The token is decoded only in your browser and never sent anywhere. Still, treat real tokens like passwords.
Is my data sent anywhere?
No. Everything runs in your browser, on your device — nothing you paste or open is uploaded.