JWT Decoder Articles

JWT Security Vulnerabilities: alg:none, Algorithm Confusion, and Secure Token Storage

The alg:none attack, RS256/HS256 algorithm confusion, weak HS256 secrets, localStorage vs httpOnly cookies, and revocation without statefulness — JWT security vulnerabilities are specific and avoidable. Here's how each one works and how to fix it.

Jun 9, 2026

JWT Decoder — Debug Authentication Errors by Inspecting Token Claims

Learn how to use a JWT decoder to debug 401 errors, understand the header, payload, and signature sections, check expiry and audience claims, and identify security issues like alg:none attacks.

Jun 7, 2026

JWT Decoder — Inspect Any JSON Web Token Instantly

Learn what's inside a JSON Web Token, how to read the header, payload, and expiration claims, and how to use a free JWT decoder to debug authentication issues instantly.

Jun 6, 2026