🔐 JWT Decoder

Paste a JSON Web Token to decode and inspect its header, payload, and claims.

What is a JWT?

JSON Web Tokens (JWT) are an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. They're commonly used for authentication and authorization in web applications.

A JWT consists of three parts separated by dots: Header (algorithm and token type), Payload (claims/data), and Signature (verification).

⚠ī¸ Security note: This tool only decodes the token — it does not verify the signature. Never paste sensitive production tokens into online tools. This tool runs entirely in your browser and sends nothing to any server.