What is a JWT (JSON Web Token)?

A JWT is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts separated by dots: Header, Payload, and Signature.

Is my JWT token safe to paste into this tool?

Yes, 100%. Decoding happens locally in JavaScript using Base64URL parsing. Your secret tokens and payload data never leave your browser.

Can this tool verify the signature of my JWT?

This tool decodes and displays the JSON claims in the header and payload. Secret key verification requires server-side validation or public keys.

What does an expired JWT payload look like?

An expired token includes an `exp` (Expiration Time) claim represented as a Unix epoch timestamp that is earlier than the current time.

Free JWT Decoder

100% Client-Side: Your data never leaves your browser. Zero server processing or data storage.

JWT Decoder

Paste a JSON Web Token below. The tool will automatically decode the header, payload, and display the signature. This tool does NOT verify signatures — it only decodes the content.

Paste your JWT token:

Free JWT Decoder

JWT Decoder

Related Tools You Might Like