DevScratchpad

JWT Decoder & Inspector (Offline & Secure)

Decode and inspect JWTs (JSON Web Tokens) locally in your browser. We never log or transmit your tokens to a server.

How to use

  1. Paste your base64-encoded JWT into the input field.
  2. The tool automatically splits and decodes the Header and Payload claims.
  3. Verify expiration dates (exp, iat, nbf) automatically converted to local time.

Technical Considerations

  • Malformed tokens or invalid base64 padding.

100% Client-Side Privacy: This tool executes entirely within your browser's runtime environment. No payloads, tokens, or inputs are transmitted to external servers. Safe for offline usage.

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