A JSON Web Token (JWT) is a compact, URL-safe token made of three Base64URL-encoded parts separated by dots: header, payload, and signature. This decoder splits the token and reveals the header and payload claims in readable JSON, so you can see exactly what data a token carries.

• Decode the header and payload of any JWT • Automatically read exp, iat, and nbf as human-readable dates • See at a glance whether a token has expired • 100% in-browser — your token is never uploaded • Copy the decoded header or payload with one click

1. Paste your JWT into the input box 2. The header and payload appear instantly as formatted JSON 3. Review the expiry status and timestamp claims 4. Copy any section you need