Backend & APIs
Popular 13 guides publishedREST, HTTP methods, authentication, webhooks, CORS — how servers talk and why your API calls fail at 2am. Every concept explained starting from what AI actually generates.
API Foundations
What Is an API?
The beginner's guide for AI-assisted developers — when AI "gets weather data," here's exactly what it's doing and how to fix it when it breaks.
🔌 RESTWhat Is a REST API?
HTTP methods, status codes, and fetch() explained — why 90% of AI-generated backends are REST and what that actually means.
🔌 HTTPWhat Are HTTP Status Codes?
200, 404, 500, 401, 403 — a vibe coder's guide to API responses. What each code means and how to handle them in AI-generated code.
⚙️ BackendWhat Is Middleware?
Express & Next.js middleware explained for AI coders — what runs before your route handler and why AI always adds app.use().
🔔 EventsWhat Is a Webhook?
Event-driven APIs explained for AI coders — Stripe payments, GitHub events, Slack bots. How to receive them and what can go wrong.
📊 GraphQLWhat Is GraphQL?
The alternative to REST — queries, mutations, and why AI sometimes generates GraphQL instead of REST endpoints.
⚡ Real-TimeWhat Are WebSockets?
Real-time communication for AI-built apps — chat, live updates, and collaborative features. How WebSockets work and when to use them.
Authentication & Security
What Is Authentication?
Login systems explained for AI coders — sessions, tokens, cookies, and why "it works on localhost" but breaks in production.
🔑 JWTWhat Is a JWT?
JSON Web Tokens explained — how AI implements stateless authentication, what's in that eyJh... string, and when JWTs are the wrong choice.
🔑 OAuthWhat Is OAuth?
"Sign in with Google" explained for AI coders — the OAuth flow, access tokens, refresh tokens, and common AI implementation mistakes.
🚦 SecurityWhat Is Rate Limiting?
Protecting your API from abuse — what rate limiting is, how to implement it in AI-generated Express/Next.js apps, and what happens without it.
The CORS Problem (It Happens to Everyone)
What Is CORS?
The complete guide — why the browser blocks your API calls, what the Access-Control headers mean, and how to configure it correctly.
🌐 CORSWhat Is a CORS Error? How to Fix It
The most common AI-coder headache. Step-by-step fix guide for Express, Next.js, FastAPI, and any framework AI builds for you.
Your Backend Needs a Database
Learn where AI stores your data and how to work with it safely.