Chapter 20 — Node/Express API layout скачать в хорошем качестве

Chapter 20 — Node/Express API layout

Chapter 20 — Node/Express API layout In this chapter, we explain how a Node.js / Express API works step by step, using real production code and beginner-friendly explanations. You will learn: ✅ What an API endpoint is ✅ How React communicates with Express using HTTP ✅ How Express communicates with MySQL using mysql2/promise ✅ Why SELECT returns rows, but INSERT / UPDATE / DELETE return result metadata ✅ How JSON is converted into JavaScript objects using express.json() ✅ How to safely send SQL queries using placeholders (?) ✅ Why POST/PUT/DELETE return status codes, not full data 🔁 Communication Flow Explained React (Browser) ⇅ HTTP (GET, POST, PUT, DELETE) Node.js / Express ⇅ MySQL Protocol MySQL Database Node.js acts as: Server for the React frontend Client for the MySQL database 📦 Key Concepts Covered app.get("/api/products") — endpoint explanation req.body and JSON handling app.use(express.json()) db.query() and parameterized SQL Destructured assignment: const [rows] = await db.query(...) const [result] = await db.query(...) rows = real database data result = metadata (insertId, affectedRows) 🎯 Who This Video Is For Beginners learning Node.js backend Students confused about rows vs result React developers learning backend APIs Anyone learning Express + MySQL node js api express api tutorial node express mysql mysql2 promise react node api crud api node js express json middleware req body json rows vs result mysql node js select insert update delete backend for beginners rest api explained http get post put delete node js mysql tutorial full stack react node mysql