🔐 JWT Decoder

Decode and inspect JWT tokens.

How to Use the JWT Decoder

JSON Web Tokens (JWT) are compact, URL-safe tokens used for secure information exchange. This decoder helps you inspect the contents of JWT tokens without sending them to any server.

JWT Structure

A JWT consists of three parts separated by dots: Header.Payload.Signature. The header contains algorithm info, the payload contains claims (data), and the signature verifies authenticity.

Decoding Steps

  1. Copy your JWT token (starts with eyJ...)
  2. Paste it into the token input field
  3. Click "Decode JWT" to parse the token
  4. Review the decoded header, payload, and signature sections
  5. Check the expiration time if present

Security Note

This tool decodes tokens locally in your browser. Never share your JWT tokens publicly, as they may contain sensitive information or grant access to protected resources.

Common Claims