JWT Decoder
Decode JSON Web Tokens (JWT) to read the header and payload, free in your browser. No sign-up — tokens never leave your device.
Decode JSON Web Tokens
JWT Decoder splits a JSON Web Token into its header and payload and displays both as readable JSON, entirely in your browser — the token is never sent to a server, which matters since JWTs often contain sensitive claims.
How to use
- Paste the encoded JWT into the input box.
- View the decoded header and payload claims instantly.
- Copy the decoded JSON for inspection or debugging.
Common use cases
- Checking what claims and expiry time an auth token actually contains.
- Debugging why an API is rejecting a JWT as invalid or expired.
- Inspecting a third-party token during integration work.
More Network & Security
- Bcrypt Generator — Hash passwords and verify Bcrypt matches.
- User-Agent Parser — Extract OS and browser from UA strings.
- UUID Generator — Generate completely random UUIDs.
- MAC Address Generator — Create random MAC addresses for testing.