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JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, and expiration status.

What is JWT Decoder?

JWT Decoder is a free online tool that decodes JSON Web Tokens and displays their header, payload, and claims. Essential for debugging authentication in QA testing.

How to decode a JWT token?

  1. Copy your JWT token from browser DevTools or API response
  2. Paste it into the input field
  3. The tool instantly decodes and displays the header and payload
  4. Check expiration (exp), issuer (iss), and other claims

Is JWT decoding safe?

Yes — JWT tokens are only Base64-encoded, not encrypted. This tool processes everything in your browser; no data is sent to any server.