Free JWT Decoder & Inspector
Paste a JSON Web Token to instantly decode and inspect its header, payload, and claims. Check expiration times and verify token structure without any server-side processing.
Inspect JWTs Without the Command Line
JSON Web Tokens are used everywhere in modern authentication. When you need to quickly check what claims a token contains, whether it has expired, or what algorithm it uses, this decoder gives you a clean, formatted view of every component in seconds.
Frequently Asked Questions
Yes. All decoding happens entirely in your browser. The token is never sent to any server, so your credentials and sensitive claims remain private.
The tool decodes and displays the header, payload, and signature components. For full cryptographic signature verification, you would need to provide the signing key, which this tool supports for HMAC-based tokens.