📈 Stock Analyzer – Real-Time Stock Analysis Web Application

A full-stack stock analysis web application built using Node.js, Express, and Data Structures & Algorithms (DSA).

This project demonstrates backend engineering concepts along with algorithmic stock analysis techniques such as Stock Span, Moving Average (Sliding Window), Binary Search, and Trend Detection.

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🚀 Project Overview

Stock Analyzer is a backend-driven financial analytics system that:

• Reads historical stock data from CSV files
• Performs algorithmic analysis using DSA concepts
• Exposes REST APIs
• Displays results through a dynamic frontend dashboard

This project integrates:

• ✅ Backend Engineering (BEE)
• ✅ Data Structures & Algorithms
• ✅ OOPS in JavaScript
• ✅ File System CRUD operations
• ✅ Client–Server Architecture

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🏗️ System Architecture

Client (Browser UI)
⬇
Express Server (Node.js)
⬇
File System (CSV Data Storage)
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Algorithm Processing (DSA Layer)
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JSON Response

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🧠 DSA Concepts Implemented

1️⃣ Stock Span Problem (Stack – O(n))

Calculates how many consecutive previous days had lower stock prices.

2️⃣ Moving Average (Sliding Window – O(n))

Efficient 5-day moving average calculation.

3️⃣ Binary Search (O(log n))

Search stock price by date efficiently.

4️⃣ Sorting & Aggregation

Find highest price, lowest price, and growth analysis.

5️⃣ Trend Detection

Identifies:

• 📈 Bullish
• 📉 Bearish
• ➖ Sideways

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⚙️ Backend Features

• Express Server Setup
• REST API Design
• File Handling using fs
• Modular OOPS-based architecture
• Static File Serving
• Error Handling
• JSON API Responses

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📊 API Endpoints

Method	Endpoint	Description
GET	/api/analysis	Get stock analytics (highest, lowest, moving average, trend)
GET	/api/stock	Get full historical stock data
GET	/api/search?date=YYYY-MM-DD	Search stock price by date

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🎨 Frontend Features

• Modern dashboard UI
• Run stock analysis
• Search stock by date
• Historical stock data table
• Percentage change calculation
• Trend visualization

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📁 Project Structure

stock-analyzer/ │ ├── server.js ├── data/ │ ├── stock-data.csv │ └── stocks.json │ ├── services/ │ ├── DataManager.js │ ├── Stock.js │ ├── StockAnalyzer.js │ └── TrendDetector.js │ ├── public/ │ ├── index.html │ ├── style.css │ └── script.js │ └── package.json

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💻 Tech Stack

• Node.js
• Express.js
• JavaScript (ES6)
• HTML5
• CSS3
• File System (No Database)

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🎓 Learning Outcomes

This project demonstrates:

• Real-world backend system design
• Clean modular coding using OOPS
• Efficient algorithm implementation
• REST API architecture
• Client–Server communication

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🔥 Why This Project Is Strong

Unlike basic CRUD projects, this application:

✔ Implements real DSA algorithms
✔ Demonstrates engineering-level thinking
✔ Shows understanding of time complexity
✔ Integrates backend + algorithm + UI
✔ Simulates financial analytics systems

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🚀 How to Run the website Locally

git clone https://github.com/Arjunuk1/stock-analyzer.git
cd stock-analyzer
npm install
node server.js