The API Request/Response Cycle
Every tap in a modern app triggers this cycle: your app asks an API, the API asks its data sources, and a structured JSON answer travels back
All guides in this chapter
What is an API? REST, HTTP Methods and JSON Explained for Beginners
The restaurant-menu analogy, a real request walkthrough, HTTP verbs, status codes, and why every modern app depends on APIs.
Read articleREST vs GraphQL vs gRPC: Choosing the Right API Architecture
Compare REST, GraphQL, and gRPC across performance, caching, and tooling to choose the right architecture for your next service.
Read articleAPI Authentication Explained: API Keys, OAuth 2.0, and JWT
How API authentication actually works — API keys, OAuth 2.0, and JWT explained, with what each proves and when to use them.
Read articleAPI Versioning Strategies: URI, Header, and Content Negotiation
API versioning strategies explained: compare URI, header, and content negotiation approaches, plus deprecation policy for public APIs.
Read articleAPI Rate Limiting and Throttling: Algorithms and Implementation
A technical guide to rate limiting algorithms — fixed window, sliding window, token bucket, leaky bucket — and how to implement them correctly.
Read articleAPI Gateway Patterns: Routing, Aggregation, and Backend for Frontend
API gateway patterns explained for microservices: routing vs aggregation, the BFF pattern, and where the gateway becomes a bottleneck.
Read articleOWASP API Security Top 10 Explained
A practical walkthrough of the OWASP API Security Top 10, with real-world BOLA examples and fixes engineers can apply today.
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