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EasyShop E-Commerce API

Backend Spring Boot API for Modern E-Commerce

Spring Boot Java MySQL JWT Auth RESTful API

YearUp Java Development Program - Capstone Project

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Project Overview

EasyShop is a full-featured e-commerce backend API that powers an online shopping platform.

Key Features:

Browse products by category
Search and filter products with advanced queries
Manage personal shopping carts
Update user profiles
Secure authentication with JWT tokens

Project Goals:

Fix existing bugs in the legacy codebase
Implement new features for Version 2
Ensure secure and scalable architecture
Provide comprehensive API documentation

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Technical Architecture

Backend Technologies:

Spring Boot 2.7 Spring Security Spring Data JDBC MySQL Database JWT Authentication Maven

Architecture Pattern:

📁 Controllers (REST Endpoints)

↓

📁 Service Layer (Business Logic)

↓

📁 DAO Layer (Data Access Objects)

↓

🗄️ MySQL Database

Security:

JWT token-based authentication
Role-based access control (USER, ADMIN)
Secured endpoints with @PreAuthorize

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Development Phases

✅ Phase 1: Categories

Implemented CRUD operations for product categories

GET all categories
GET category by ID
POST new category (Admin)
PUT update category (Admin)
DELETE category (Admin)

✅ Phase 2: Bug Fixes

Fixed critical issues in product management

Fixed product search/filter bugs
Resolved duplicate product issue
Corrected SQL query parameters
Fixed update logic creating duplicates

✅ Phase 3: Shopping Cart

Full shopping cart implementation

View cart contents
Add products to cart
Update product quantities
Remove products
Clear entire cart

✅ Phase 4: User Profiles

Profile management endpoints

GET user profile
PUT update profile
Secure authentication required
Data validation

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Live Demo - Setup

Prerequisites for Testing:

1. Start the Application:

Run EasyshopApplication.main() in IntelliJ

2. Login to Get Token:

POST /login

{
    "username": "user",
    "password": "user"
}

3. Copy the JWT Token from Response

4. Add to Authorization Header: Bearer Token

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Demo: Categories API

Let's test the Categories endpoints:

GET /categories

Expected: List of all product categories

GET /categories/1

Expected: Single category details

POST /categories (Admin only)

{
    "name": "Books",
    "description": "All kinds of books"
}

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Demo: Shopping Cart API

Shopping Cart Operations:

GET /cart

View current cart (should be empty initially)

POST /cart/products/1

Add product ID 1 to cart

PUT /cart/products/1

{
    "quantity": 3
}

Update quantity to 3

DELETE /cart/products/1

Remove product from cart

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Demo: User Profile API

Profile Management:

GET /profile

Get current user's profile information

PUT /profile

{
    "firstName": "John",
    "lastName": "Doe",
    "phone": "555-1234",
    "email": "john.doe@example.com",
    "address": "123 Main St",
    "city": "New York",
    "state": "NY",
    "zip": "10001"
}

Update profile information

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Challenges & Solutions

🔧 Challenge 1: Product Search Bug

Problem: SQL parameters in wrong order
Solution: Reordered parameters to match query placeholders

🔧 Challenge 2: Duplicate Products on Update

Problem: Update method was creating new products
Solution: Fixed SQL to use UPDATE instead of INSERT

🔧 Challenge 3: Shopping Cart State Management

Problem: Complex cart operations with quantity tracking
Solution: Implemented proper check for existing items before adding

🔧 Challenge 4: Security Implementation

Problem: Protecting sensitive endpoints
Solution: JWT authentication with Spring Security

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Project Complete! 🎉

Achievements:

✅ Fixed all identified bugs
✅ Implemented full shopping cart functionality
✅ Added user profile management
✅ Secured all endpoints with JWT
✅ Created comprehensive test suite

Future Enhancements:

Order processing and checkout
Payment integration
Product reviews and ratings
Email notifications

Questions?