🍏 Node.js

• Syncronized vs. Asyncronized?
• OOP vs. Node.js?
• What are the promises? Resolve Reject? Callback?
• Where not to use async/await?
• V8, Call Stack, Node APIs, Callback Queue, Event Loop

---

1. Callback example:

fs.readFile("file1.txt", (err, data) => {
  if (err) throw new Error(err);
  console.log(data);
  console.log("Nisi lerdi ako nemas gicu");
});

console.log("Ona mala je ko kamen");

2. Promise example:

const data = await fs.readFileSync("file1.txt");
console.log(data);
console.log("Nisi lerdi ako nemas gicu");

📔 Most used Node.js modules

• express
• dotenv
• path
• fs
• axios / request-native-promise
• moment
• body-parser
• cron
• lodash
• validator
• nodemailer

---

• mongoose
• connect-mongo
• express-session
• bcrypt [Check if it's depricated]
• cookieParser
• jsonwebtoken
• passport/passport-facebook/passport-jwt/passport-local
• cors / helmet

📽 Project Arhitecture

🌲 Structure of a project

├─ 📁 .vscode           [optional]
|   ├─ 📜 settings.json [optional]
|   └─ 📜 launch.json   [optional]
|
├─ 📁 node_modules (auto-generate)
|
├─ 📁 server
|   ├─ 📁 api
|   |   ├─ 📁 user
|   |   |   ├─ 📜 ❔ index.js
|   |   |   ├─ 📜 user.routes.js
|   |   |   ├─ 📜 user.model.js
|   |   |   ├─ 📜 user.controller.js
|   |   |   ├─ 📜 user.service.js
|   |   |   └─ 📜 [singleton modules, services]
|   |   └── ...
|   |
|   ├─ 📜 server.js
|   ├─ 📜 router.js
|   └──📁 services
|       ├─ 📜 logger.js
|       ├─ 📜 dbconfig.js
|       └─ 📜 [mostly singleton modules, services, mailer, middleware, varibales]
|
|
├─📁 public
|   ├─📁 views [.ejs, .html, .pug...]
|   ├─📁 scripts [frontend javascript files .js ]
|   ├─📁 stylesheets [.css, less. cess...]
|   ├─📁 images
|   └─📁 assets [optional][media: files, audio, video...]
|
├─ 📜 .eslintrc.json / .eslintrc.js
├─ 📜 .package.json
├─ 📜 .package-lock.json (auto-generate)
├─ 📜 .gitignore
├─ 📜 .env (.staging.env && .production.env)
├─ 📜 Procfile (if you are deploying on heroku)
└─ 📜 README.md

🖥 About arhitecture

• logger.js - morgan/winstong... logger configuration
• dbconfig.js - mongo/dynamo/mysql... configuration
• .env
• .eslintrc.json - linter configuration
• package.json - node project/packages configuration
  • NODE_ENV
  • dependecies
  • engine
  • scripts

api/<something>

• <something>.routes.js - routers
• <something>.model.js - DB collection
• <something>.controller.js - logic
• <something>.services.js - queries

🗯 Documentation comments

/**
*@description
*@return
*@params
*/
const functionName = [async]() => { };