What is a JWT?
JSON Web Token (JWT) is an open standard that defines a compact way for securely transmitting information between parties as a JSON object.
🔐 Security Utility
JWT Debugger
Instantly decode JSON Web Tokens to inspect headers and claims. No data is sent to the server.
Encoded Token
Decoded Result
Header
// Header will appear here
Payload
// Payload will appear here
Is it safe to decode JWTs online?
Decoding JWTs on public websites can sometimes be risky if they send your token to their backends. Our JWT Debugger is designed for the modern security-conscious developer.
Client-Side only
This implementation uses atob() in your browser window. Your sensitive authentication tokens never leave your computer. We do not store, log, or track your tokens in any way.
Verification
Note: This tool is for decoding and inspection. It does not verify the signature. You should use your internal server logic to verify token integrity against your private keys.
Frequently Asked Questions
Can this steal my login token?
No. Unlike other online debuggers, we perform no network requests when you click 'Decode'. You can even use this tool offline.
What parts are in a JWT?
A JWT typically consists of three parts: Header, Payload, and Signature, separated by dots.