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JWT Decoder & Token Inspector

Decode JSON Web Tokens (JWT) locally to inspect header properties, claims payload, and expiration time.

How to Use JWT Decoder & Token Inspector

  1. Enter or upload your input data into the designated tool area.
  2. Click the action button to process your data instantly.
  3. Review your result in the output preview section.
  4. Copy or download your processed file for free.

Frequently Asked Questions

What is a JWT Decoder?
A JWT Decoder parses encoded JSON Web Tokens into readable JSON objects representing the token header and payload claims.
Are my tokens sent to a remote server?
No. Decoding is performed 100% client-side using JavaScript `atob` and URI decoding in your browser session for maximum security.
Can this tool verify token signatures?
Signature verification requires secret keys or public certs. This tool focuses on client-side token inspection and expiration checking.