Jwudtool Tutorial 99%

jwudtool verify --secret mysecret <token> Expected output:

HEADER:

jwudtool verify --pubkey public.pem <token> Need to change a claim for testing? Clone and modify:

Mastering JWTs: A Step-by-Step Tutorial to jwudtool jwudtool tutorial

PAYLOAD:

Enter — a lightweight, command-line utility designed to simplify JWT inspection, manipulation, and testing.

Learn how to decode, verify, and debug JSON Web Tokens using jwudtool. Perfect for developers and security testers. Introduction JSON Web Tokens (JWTs) are everywhere — from authentication flows to API authorization. But if you’ve ever tried to manually decode a JWT or debug a signature mismatch, you know it can get messy fast. Perfect for developers and security testers

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c Run:

✗ Signature mismatch For RS256 tokens, use a public key:

go install github.com/youruser/jwudtool@latest Got a feature request or found a bug? Open an issue on GitHub . eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9

"alg": "HS256", "typ": "JWT"

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: