JWT Decoder

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🔑 JWT Decoder & Inspector

Decode and inspect JSON Web Tokens (JWT) in real-time. Verify structures and examine token expiration details securely inside your browser.

📋 HEADER: ALGORITHM & TOKEN TYPE 
{ }
📄 PAYLOAD: DATA & CLAIMS 
{ }
🔒 SIGNATURE: VERIFIED (CLIENT SIDE) 
HMACSHA256( ... )

How JWT Decoder works

  1. Input or paste your encoded base64 JSON Web Token (JWT) into the **Encoded** textarea.
  2. JWT tokens are composed of three parts separated by dots (`.`): Header, Payload, and Signature.
  3. The decoder splits the segments, performs Base64Url decoding, and formats JSON claims instantly in your browser.
  4. **100% Secure**: Decoding is completed entirely client-side using JavaScript. Your tokens never leave your computer, ensuring database keys or sub IDs are kept private.