JWT Decoder

Decode and inspect JWT tokens. Header, payload and expiry at a glance.

A JSON Web Token (JWT) is a compact, URL-safe token used to securely transmit information between parties — most commonly for authentication. When a user logs in, the server issues a JWT that the client sends with every subsequent request to prove identity. JWTs have three parts separated by dots: a Header (algorithm info), a Payload (claims and user data), and a Signature (for verification). Our JWT decoder lets you inspect the header and payload instantly — and tells you whether the token has expired.

How to use:

• 1. Paste your JWT token into the input field
• 2. Click Decode
• 3. View the decoded header and payload fields clearly
• 4. Check the expiry banner — green means valid, red means expired