✗ Signature mismatch For RS256 tokens, use a public key:
jwudtool version # Output: jwudtool 0.2.0 | Command | Purpose | |---------|---------| | decode | Decode header + payload without verifying signature | | verify | Check signature using a secret or public key | | forge | Create a new token from an existing one (change claims) | | fuzz | Test token against common attacks | Tutorial: Decode a JWT Given this sample token:
Happy debugging! This tutorial is for educational purposes only. Only test tokens you own or have permission to analyze. jwudtool tutorial
go install github.com/youruser/jwudtool@latest Got a feature request or found a bug? Open an issue on GitHub .
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c Run: ✗ Signature mismatch For RS256 tokens, use a
HEADER:
jwudtool verify --secret mysecret <token> Expected output: go install github
"sub": "1234567890", "name": "John Doe", "iat": 1516239022