HTTP Headers Explained: What Every Developer Should Know
HTTP headers control caching, security, content type, authentication, and more. Learn what every important request and response header does — and how to read them like a pro.
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Security
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What Is CORS and How Do You Fix It? A Plain-English Guide
CORS errors block your fetch requests before they reach your code. Learn why the browser enforces the Same-Origin Policy, how preflight requests work, and how to fix every common CORS error on Apache, nginx, Node, and PHP.
Read ArticleHow to Generate and Use HMAC Signatures for API Security
HMAC signatures let APIs verify that requests are authentic and unmodified. Learn how HMAC works, how to sign and verify requests, and generate signatures instantly free.
Read ArticleBCrypt Hashing Explained: Why It's the Gold Standard for Passwords
BCrypt is deliberately slow — and that's the point. Learn why fast hashing algorithms are wrong for passwords, how BCrypt works, and how to use it correctly in your apps.
Read ArticleHow to Check SSL Certificates Online (And What to Look For)
SSL certificate errors kill user trust and break HTTPS. Learn how to check any certificate's validity, expiry, chain, and common failure modes — free, in your browser.
Read ArticleJWT Decoded: Understanding JSON Web Tokens Without the Jargon
JWTs are everywhere in modern auth — but most developers use them without truly understanding them. Learn what's inside a token, how signing works, and common pitfalls.
Read ArticleMD5 vs SHA-256: Which Hash Should You Use and Why
MD5 and SHA-256 both produce hashes — but they're not interchangeable. Learn what each is good for, why MD5 is broken for security, and when to use which algorithm.
Read ArticleHow to Generate Strong Passwords (And What Makes One Actually Secure)
What actually makes a password strong? Length, randomness, entropy — explained plainly. Plus how to generate and check secure passwords instantly in your browser.
Read ArticleBase64 Encoding Explained: What It Is and When to Use It
Base64 isn't encryption — it's encoding. Learn what it actually does, when to use it, when not to, and how to encode and decode instantly in your browser.
Read ArticleTry the tools yourself — free.
Format, encode, generate, and convert — everything runs client-side. No account needed.