JSON Security & Auth — JWT & Safe Parsing
JWTs, secure JSON handling, and protecting your APIs from malformed input.
PASETO vs JWT: A Safer Token Format by Design
PASETO removes the footguns that make JWT dangerous — no alg:none, no algorithm confusion, no weak-crypto choices. How it works, its versioned purposes, and when to pick it over JWT.
Where to Store JWT Tokens: localStorage vs Cookies vs Memory
The token-storage question decides your XSS and CSRF exposure. Why localStorage is risky, why HttpOnly cookies aren't a silver bullet, and the in-memory + refresh-cookie pattern teams use in 2026.
JWT Vulnerabilities: The alg:none, Algorithm Confusion & Weak-Secret Attacks
JWTs aren't secure by default — they're secure by validation. The alg:none bypass, RS256/HS256 algorithm confusion, weak HMAC secrets, and the checklist that stops all three.
OAuth 2.0 Token Responses: The JSON You Need to Know
Every OAuth flow ends in a JSON token response. Learn what access_token, refresh_token, expires_in and token_type mean, and how to handle them securely.
JSON Web Key Sets (JWKS): How OAuth Actually Verifies Tokens
The JSON format behind JWKS endpoints — how public keys are published, how key rotation works via `kid`, and how to verify a JWT's signature without a shared secret.
JSON Security: Injection, Deserialization Attacks, and Safe Parsing
Learn how JSON is exploited in injection attacks, insecure deserialization, prototype pollution, and ReDoS — with concrete fixes for each vulnerability.
JWT Tokens — How to Decode and Inspect Them Safely
Learn the structure of JWT tokens, how to decode them without a secret key, what each claim means, and how to check if a token has expired.
JWT Tokens Explained — How They Work and How to Decode Them
A clear explanation of JSON Web Tokens (JWT): structure, how they work, and how to safely decode them without sending to a server.