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Elysium Spark Note

Full Stack Js Programmer

  • April 5, 2025
  • Com 0

1.Introduction to Full Stack JavaScript

A Full Stack JavaScript Developer is proficient in both front-end and back-end development using JavaScript. They work with frameworks, libraries, and databases to build dynamic web applications. Key Technologies Covered:
  • Front-End: HTML, CSS, JavaScript, React.js, Angular, Vue.js
  • Back-End: Node.js, Express.js
  • Database: MongoDB, MySQL, PostgreSQL
  • Version Control: Git, GitHub
  • Deployment & DevOps: Docker, AWS, Firebase

2.Front-End Development 

Core Technologies
Technology Description
HTML5 Structure of web pages
CSS3 Styling and layout
JavaScript (ES6+) Dynamic web interactions
React.js / Vue.js / Angular Front-end frameworks for UI
HTML & CSS Essentials
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<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>My First Page</title>

    <link rel="stylesheet" href="styles.css">

</head>

<body>

    <h1>Hello, World!</h1>

</body>

</html>
JavaScript Essentials
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// ES6 Features

let name = "John";

const age = 25;

const greet = () => console.log(`Hello, ${name}!`);

greet();
DOM Manipulation
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document.getElementById("demo").innerHTML = "Hello JavaScript!";

document.querySelector(".btn").addEventListener("click", () => alert("Clicked!"));

3.Front-End Frameworks & Libraries 

React.js Basics
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import React from "react";

function App() {

    return <h1>Hello, React!</h1>;

}

export default App;
React State & Props
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const Counter = () => {

const [count, setCount] = React.useState(0);

return (

<div>

<p>Count: {count}</p>

<button onClick={() => setCount(count + 1)}>Increment</button>

</div>

);

};

4. Back-End Development (Node.js & Express.js)️

Node.js Essentials
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const fs = require('fs');

// Read a file

fs.readFile('file.txt', 'utf8', (err, data) => {

if (err) throw err;

console.log(data);

});
Express.js Server
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const express = require("express");

const app = express();

app.get("/", (req, res) => {

res.send("Hello, World!");

});

app.listen(3000, () => console.log("Server running on port 3000"));
Middleware in Express
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app.use(express.json()); // Parse JSON requests

app.post("/data", (req, res) => {

res.json({ message: "Data received", data: req.body });

});

5.Database Management (MongoDB, MySQL, PostgreSQL)️

MongoDB with Mongoose
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const mongoose = require("mongoose");

mongoose.connect("mongodb://localhost:27017/mydb", { useNewUrlParser: true });

const UserSchema = new mongoose.Schema({ name: String, age: Number });

const User = mongoose.model("User", UserSchema);

User.create({ name: "Alice", age: 25 });
SQL Database Example (MySQL/PostgreSQL)
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CREATE TABLE users (

id INT AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(100),

email VARCHAR(100) UNIQUE

);

6.Authentication & Security

JWT Authentication in Node.js
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const jwt = require("jsonwebtoken");

const token = jwt.sign({ id: 123 }, "secretkey", { expiresIn: "1h" });

jwt.verify(token, "secretkey", (err, decoded) => {

if (err) console.log("Invalid Token");

else console.log("User ID:", decoded.id);

});
Password Hashing with bcrypt.js
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const bcrypt = require("bcrypt");

const password = "mypassword";

const hashedPassword = bcrypt.hashSync(password, 10);

console.log(bcrypt.compareSync("mypassword", hashedPassword)); // true

7.RESTful API Development

Basic API with Express.js
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const express = require("express");

const app = express();

app.use(express.json());

app.get("/users", (req, res) => {

res.json([{ id: 1, name: "John Doe" }]);

});

app.listen(3000, () => console.log("API running on port 3000"));
CRUD Operations with MongoDB
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app.post("/users", async (req, res) => {

const user = new User(req.body);

await user.save();

res.status(201).json(user);

});

8.Deployment & DevOps

Deploying with Docker 1.Create a Dockerfile
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FROM node:14

WORKDIR /app

COPY package.json .

RUN npm install

COPY . .

CMD ["node", "server.js"]

EXPOSE 3000
2.Build & Run Container
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docker build -t myapp .

docker run -p 3000:3000 myapp
Deploying to AWS (EC2 + Nginx + PM2) 1.Install Node.js on EC2
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sudo apt update

sudo apt install nodejs npm
2.Run App with PM2
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pm2 start server.js

pm2 save

pm2 startup

9.Version Control with Git & GitHub

Git Commands
Command Description
git init Initialize a repository
git clone <repo> Clone a repository
git add . Stage changes
git commit -m “Message” Commit changes
git push origin main Push to remote repo
git pull origin main Pull latest changes

10.Testing in Full Stack Development 

Unit Testing with Jest
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const sum = (a, b) => a + b;

test("adds 1 + 2 to equal 3", () => {

expect(sum(1, 2)).toBe(3);

});
API Testing with Postman
  • Send GET, POST, PUT, DELETE requests.
  • Use JSON payloads for data.
  • Validate responses & error handling.

11.Full Stack JavaScript Roadmap

  • Master JavaScript & ES6+.
  • Learn Front-End Frameworks (React, Vue, Angular).
  • Understand Back-End with Node.js & Express.js.
  • Work with Databases (MongoDB, SQL).
  • Build RESTful APIs & Authentication.
  • Version Control with Git & GitHub.
  • Deploy Applications using Docker & AWS.
  • Write Unit Tests for Reliability.
 
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