api

Build a small REST API on Node 22 with Express: routes, middleware, JSON body parsing, Zod input validation, status codes, and a clean async error pipeline you won't outgrow.

How to keep one client from breaking the system for everyone else. The four canonical algorithms (fixed window, sliding window, token bucket, leaky bucket), distributed limiting with Redis, and the polite way to tell a client "slow down".

Explore the core concepts of OAuth 2.0, its various grant types, and how it enables secure, delegated access without sharing credentials. Understand the roles and the step-by-step authorization process.

Learn the foundational principles behind RESTful API design. This lesson covers statelessness, client-server architecture, uniform interface, effective use of HTTP methods and status codes, and practical tips for building scalable and maintainable web services.

HTTP status codes are essential for effective communication between clients and servers on the web. This lesson breaks down each class of status codes (1xx, 2xx, 3xx, 4xx, 5xx), explains their meaning, and provides practical guidance on when to use them in your applications.