JWT Decoder

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

Encoded Token
🔴 Header 
Decoded header will appear here...
đŸŸŖ Payload 
Decoded payload will appear here...
đŸŸĸ Decoded Claims
Claims will be listed here with human-readable descriptions...
đŸ”ĩ Signature 
Signature info will appear here...

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 parts separated by dots: a Header (algorithm and type), a Payload (claims/data), and a Signature (verification). JWTs are widely used for authentication, authorization, and information exchange in web applications.

How to Use

  1. Paste your JWT token in the input field above
  2. The Header shows the algorithm (e.g., HS256, RS256)
  3. The Payload shows the claims (user data, expiration, etc.)
  4. The Claims table provides human-readable descriptions for standard claims
  5. Expiration status is shown automatically if the token contains an exp claim

🔒 Privacy note: This tool runs entirely in your browser. Your JWT is never sent to any server.