JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, and signature without any server-side processing.

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About JWT Decoder

Decode and inspect JSON Web Tokens (JWTs) directly in your browser. No data is sent to any server — all decoding happens client-side for maximum security.

What is a JWT?

A JSON Web Token is a compact, URL-safe way to represent claims between two parties. It consists of three parts: Header (algorithm and type), Payload (claims/data), and Signature (verification). JWTs are widely used for API authentication and authorization.

What We Show

Header with algorithm info, decoded payload with all claims, signature string, expiration status, and token validity duration.