JWT Decoder

How to Use the JWT Decoder

1. Paste your JWT into the input area, or click "Load Sample" to try an example token.
2. The header, payload, and signature are decoded and displayed automatically in real time.
3. Timestamp fields (exp, iat, nbf) are shown as human-readable dates with expiration status.
4. Click Copy on any section to copy its contents to your clipboard.

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three Base64URL-encoded parts separated by dots: a header (algorithm and type), a payload (claims), and a signature.

Features

• Real-time decoding as you type or paste
• Human-readable timestamps for exp, iat, and nbf claims
• Token expiration status at a glance
• One-click copy for header and payload
• 100% client-side processing for full privacy
• No data stored, no sign-up required