JWT Decoder

Decode and validate JSON Web Tokens (JWT) safely in your browser

About JWT Decoder

This tool decodes JSON Web Tokens (JWT) and performs basic validation checks. All processing happens in your browser - your tokens are never sent to any server.

Security Note:

  • This tool only decodes and validates the structure and claims
  • Signature verification requires the secret key (not provided here)
  • Never share your JWT tokens or secret keys publicly
  • Always validate tokens on your server before trusting them