Web & APIs

How the web actually works, and how programs talk to each other.

Series in this category

Complete courses on this topic, read in order. The standalone posts follow.

5 parts · ~45 min total · starts at Part 1

Blazor vs React vs Angular

One app, four clients, one measurement. The same todo application was built in Blazor WebAssembly, Blazor Server, React 19 and Angular 22 by headless Claude Code sessions from one spec, judged by one frozen suite of 61 tests, then measured the same way: bytes, startup, a 10,000-row list, memory, lines of code, accessibility, and how many turns the AI needed. Five parts: the method, the two Blazor builds, React, Angular, and the results with seven hypotheses settled one by one.

All 5 parts →📦 coder000-todo-four-ways: the API, the suite, the reference client and the four AI-built clients with their per-step commits 📄 SPEC.md, the contract every client implements 📊 sessions.csv, one row per metered Claude Code session 🧭 The render-mode post this series measures: Blazor Server vs WebAssembly vs Hybrid

Posts

ASPNETCORE_URLS, --urls, launchSettings, Kestrel Endpoints and UseUrls: Which Port Your ASP.NET Core App Listens On, Tested

Which port your ASP.NET Core app listens on, and why. ASPNETCORE_URLS, --urls, launchSettings and UseUrls run against each other, winner shown. Oct 14, 2026 6 min read

C# to TypeScript: How Classes, Records and Enums Become Interfaces, Tested with System.Text.Json and tsc

Convert C# DTOs to TypeScript interfaces, with the five traps. Long ids, dates, enums, null versus optional and dictionary keys, each checked with tsc. Oct 23, 2026 6 min read

What Happens When You Type a URL and Press Enter?

In the seconds after you press Enter, a small miracle happens. DNS, TCP, TLS, HTTP and HTML, as you follow a request across the internet step by step. Jul 30, 2026 6 min read

REST APIs Explained with a Pizza Shop

REST is easier than it sounds. Order a pizza with us and you will understand GET, POST, PUT and DELETE, resources and status codes for life. Jul 30, 2026 5 min read

REST vs GraphQL vs gRPC: Choosing an API Style

Three popular ways for programs to talk to each other. How each one works, where it shines, and a simple rule of thumb for choosing between them. Jul 30, 2026 5 min read

JSON Explained: The Language APIs Speak

Almost every API today speaks JSON. Learn its whole grammar in one sitting, objects, arrays and values, plus the mistakes that trip up beginners. Jul 30, 2026 4 min read

What Is WebAssembly? Near-Native Speed in Your Browser

WebAssembly runs C#, Rust and Go inside the browser. It reaches near-native speed, and here is what it is, how it works, and why it matters for the web. Jul 30, 2026 4 min read

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